I've picked up Ustari in the past, he's been money. Ustari's extra benefit, not only is he a great goalkeeper, but he's a leader as well, makes a great Captain.
Akinfeev looks great, my scouts says he's real good, but he's so expensive. CSKA won't let him go cheap at all, I don't want to mortgage my financial situation on just one player.
My advice is to go for Francisco Guillermo Ochoa. He plays for Club America and is valued at around $2.8M or so. He'll only be okay if you need a starting GK, but he should turn out amazing. I was able to get him for only $5M up front and $7M over 24 months, this was after I unsettled him and sucked up to the America manager.
Enyeama is good, and he's cheap. I had him before, but he never seemed to settle in, and then you lose him for quite awhile during the Africa Nations Cup.