What is a good RPG to play for about 10 sessions?
I tend to prefer long, multiyear long campaigns. I do not tend to run finite campaigns but rather let the players decide where to go and what to do. If one of my campaigns ends around 10 sessions it means something went wrong (like a TPK). I have only ever run one "plot-point" style game and that was Necessary Evil (which was an excellent campaign).
As for a good RPG for such a campaign I would say...anything would work. I know its a cop-out answer but I feel that any system/setting can be run to completion in 10 sessions. All it takes is laying it out ahead of time. It is fairly easy to decide ahead of time what the PCs will encounter and when.