* Keita seen beating former finance minister Cisse in vote
* Winner's to-do list: peace, reconciliation, reconstruction (Adds polls closing, start of ballot counting, observer comments)
By Daniel Flynn and Tiemoko Diallo
BAMAKO, Aug 11 (Reuters) - Poll workers in Mali began counting votes in Sunday's high stakes presidential runoff, with former Prime Minister Ibrahim Boubacar Keita tipped to claim the difficult job of stabilising the West African nation after more than a year of turmoil.
The winner of the vote will be able to draw on more than $4 billion in foreign aid promised to rebuild the country after a French-led military intervention in January routed al Qaeda-linked rebels occupying the desert north.
He must also tackle deep-rooted corruption and forge a lasting peace with northern Tuaregs after decades of sporadic uprisings, problems that led to the overthrow of president Amadou Toumani Toure in a March 2012 coup and allowed the Islamists to seize the northern two-thirds of the country.
"Whatever the decision of the ballot box, Mali has already won," Keita, 68, told reporters after voting in the capital Bamako.
"We've come together to rebuild a new Mali and give it a new destiny," said Keita, who is opposed by Soumaila Cisse, 63, a technocrat from northern Mali who headed the West African monetary union (UEMOA).
A trickle of people came out to vote in heavy rains when polling stations in Bamako opened at 8 am (0800 GMT). But the turnout picked up as the weather cleared.
"The Malian people are tired. Our suffering has lasted long enough. Let God grant victory to the candidate who can bring us happiness again," 35-year-old housewife Aminata Traore said after voting in Bamako's Badalabougou neighbourhood.
Keita's promises to impose order and restore the honour of a nation once seen as a rare bastion of democracy and stability in a troubled region have struck a chord with voters and won him nearly 40 percent of ballots cast in the July 28 first round.
Twenty-two of the 25 losing first-round candidates have thrown their weight behind the ex-prime minister, known as IBK, who earned a reputation for firmness by crushing student protests and strikes in the 1990s.
Cisse, a former finance minister and vocal critic of the military junta that seized power last year, took 19 percent of the first-round vote with pledges to improve education, create jobs and reform the army.
"I'm proud of our people who have, in such a short time, put us on a path back to the republic and to democracy," he said. ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ For a FACTBOX on the candidates, please click For a Chronology of the Mali conflict, click ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
HOPE FOR CHANGE
Voting took place at some 21,000 polling stations across the landlocked nation, from the forested south, home to 90 percent of Mali's 16 million people, to the northern cities of Timbuktu and Gao, where Islamists imposed sharia law.
A record 49 percent of 6.8 million registered voters turned out to cast their ballots in the first round of the election last month. Observers told Reuters that participation appeared to be slightly lower for the runoff, but the vote had been peaceful and free of major technical problems.
"Overall, everything went well. There was nothing dubious," Louis Michel, the head of the European Union's observer mission, told journalists after polls closed at 6 pm (1800 GMT).
"Whoever wins will have been elected in total legitimacy," he said, as poll workers began counting ballots by candlelight in a classroom of the Djikoroni Para primary school in Bamako.
Final results are expected in two or three days, and the constitutional court has until Friday to certify them.
After challenging the result of the July 28 election, alleging fraud, Cisse promised to accept the second round's outcome. And despite highlighting a number of incidents throughout the day, his supporters refrained from denouncing the vote.
"Generally, concerning irregularities, it was better than the first round. We are hopeful," said Amadou Koita, a spokesman for Cisse.
Many Malians hope this election can change a system of "consensus politics" under which Toure seduced political opponents with government positions and failed to undertake reforms, discrediting his government in the eyes of voters.
"I think we will see a change," said Chris Fomunyoh, senior associate for Africa at the National Democratic Institute in Washington. "The personality differences between the candidates are so great that whoever loses will create a real opposition."
Keita has captured the popular mood by avoiding outspoken criticism of the coup leaders who toppled Toure, earning the tacit blessing of the military. He has also successfully courted Mali's powerful Islamic clerics, some of whom have endorsed him.
Critics say Cisse, who condemned the coup, supports the corrupt political class, but he rejects the claim, saying he is a defender of democracy.
World powers have been pushing for the vote to be held to replace the weak interim administration that has led the country since the military junta agreed to hand over power to a civilian transitional administration in April 2012.
Former colonial power France is pulling out its 3,000 troops and handing responsibility for security to a 12,600-strong U.N. peacekeeping mission which is gradually deploying.
Tuareg rebels, once allied with Islamist fighters scattered by the French-led operation, remain armed but allowed voting to take place after Bamako agreed to discuss their demands of autonomy for the sparsely populated homeland they call Azawad.
"This election can bring peace if there is a president who takes negotiations seriously," said Abarkan Ag Abzaik, mayor of Kidal, where pro-independence graffiti covers walls and the red, yellow, black and green flag of Azawad is everywhere. (Additional reporting by Adama Diarra; Editing by Joe Bavier, David Stamp and Sonya Hepinstall)