I actually really want Metro 2033 myself as it sounds awesome but i haven't got around to getting it yet, the price seems to hover right around 25-30. Anyways, Bioshock, Deadly P., and Singularity I've all played and their solid. Keep in mind Deadly P. has amazing story, characters and kind Shenmue like if you know what that is but a lot of people hated the dated looking graphics.
I want to ger Bayonetta and Nier though as I've heard they're both pretty great games..
PS2, Xbox 360, Wii, PSP-1000, DS Lite, DSi XL, RetroDuo SNES/NES Playing: Tales of Legendia, Skyrim, Phantasy Star Universe