Good games?

i recently (today) discovered a computer/video game store very near my house.. previously i''d have to go a little ways to get to one, and being that i have no car, i couldn''t get there much.. but anyway, here''s my question: what are some good computer games that are a few years old? (they have a large ''budget pc game'' section, with some good games in it like fallout.. just wondering if anyone could suggest some i should look for) thanks