I think that "save room" music in RE2 is the most memorable. It's used to great effect in that episode of Spaced, the English sitcom. I can't find the exact moment, but this is also from that episode and shows a scene from RE2.
Resident Evil Code Veronica has the greatest soundtracks in my opinion. I can't pick one from all the others, it wouldn't feel fair. Resident Evil Outbreak does the same thing for me. I can't just pick one.
Claire: Thanks. I'll do that. Steve: Hey. I was just kidding. There's no way he can get here, even if he is your brother.