How about the new Metal Gear Solid games!? :P
They never get old!
Okay okay, some real reccomendations.
Thief series - Preferably the first two, the third one is good (Deadly Shadows), but it lost something, they aren't really spy games, but they do have that sneaking aspect. They're twice as tense as any other sneaking game anyways, since it's all from a first person perspective, and the areas are always drenched in darkness.
Hitman series - As long as it isn't the first game (sucked) or Contracts (mediocre) you'll do well with Hitman 2 or Blood Money, those don't blow. The AI in both of the games are terrible though (guards in Blood Money will chase after you, be running about four inches away from you, the instant you go inside a building, they completely forget about you, and walk away) so if you're looking for intelligent guards, that aren't physic, go play Thief or... Metal Gear Solid :P
Tenchu series - Japanese assassin game, it's really good, considered some of the best. Unfortunatly, all the good ones are on the original Playstation, and they're very, VERY, hard to find.
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