I love the Resident Evil series, though I think Zero is actually my favorite. It has the best version of Rebecca and my favorite version of Wesker, plus we actually get to see him and W. Birkin interacting and being diabolical together. That, and Wesker Mode is really fun.
Resident Evil 5 is probably my second favorite, because imo that's the best version of Chris (edit to add that it's also my second favorite version of Wesker). I'm not a fan of how he was handled in Village, and I despise that they used the same VA that they used for Carlos in the RE3 remake. Nothing against the VA, it's just every time Chris opened his mouth in Village, my mind kept going, "That's Carlos That's Carlos That's Carlos".
I hope one of Capcom's upcoming remakes is Code: Veronica. I nabbed it on Xbox a while back, but man, I am not made for those old school tank controls, so I never ended up finishing it.