I actually own all of them lol, I couldn't get into NV but mayhaps I try it again. I felt it played too dated and pretty sure I had issues with Games for Windows or Windows Live. Heard good things about the Stalker games.

Fear not, the Steam version of NV has all that Windows Live nonsense removed. You might still need a few mods to "freshen" the game, but it's definitely a worthwhile endeavor.