Resident Evil 5 and Fallout 3 are "good to get". Fallout is just a matter of time, if you save before getting lv 7/14/20, and then just reload and get those levels with "good, evil or neutral". (took me 40 hours to get Plat., and yes, i hate bobbleheads.)
Resident Evil 5 is a bit harder, because you have to beat the game on Pro, were you get down with 1 hit, but with the right weapons, unlimited Ammo, and a bit caution, its possible in 30 hours.
and yeah... if you have the time, you can get the Plat of Demons Souls.. but i dont know if you have 200 hours.