PC, singleplayer, shooter games? (read details plz)?

Orange box, its cheap and pretty much the best pc fps games ever made.and i mean games, it has 5 games on it. and then theres Stalker-series, its hard, but so damn good., and fallout new vegas is good, but the shooting isnt too great, its fpsrpg. and battlefield bad company 2 and crysis, but you need pretty fast computer for those.