Hmm. Hard to put a number on them, really... but here goes.
(PC)
1. Total Annihilation + Core Contingency expansion
2. Half-Life and Opposing Force (technically different games, but...)
3. Fallout 2
4. Fallout
5. Diablo (never got Hellfire expansion
)
6. Homeworld (never got Cataclysm expansion
)
7. Command & Conquer: Tiberian Sun (Firestorm expansion optional)
8. Diablo 2 + Lord Of Destruction expansion
9. Age Of Empires II: The Conquerors (more for the new conveniences and doodads than for new civs - the Mayans BLOW)
10. Unreal Tournament 2004 Editor's Choice Edition (YEAH BABY!)
Honorable mentions: Age Of Empires I, Rise of Nations, Duke Nukem 3D, The Elder Scrolls 3: Morrowind, The Elder Scrolls 2: Daggerfall, Clive Barker's Undying, Blood, Thief: The Dark Project, Starcraft + Brood War expansion and Crusader: No Remorse.
(Console)
1. Super Metroid (
) (SNES)
2. Chrono Trigger (SNES)
3. Super Mario World (SNES)
4. The Legend of Zelda: A Link to the Past (SNES)
5. Super Mario 64 (N64, can't wait to try out DS version)
6. Onimusha (PS2)
7. Grand Theft Auto: San Andreas (PS2)
8. The Legend of Zelda (NES)
9. Shadowrun (SNES)
10. Faxanadu (NES)
Honorable mentions: Super Mario RPG: Legend of the Seven Stars (SNES), Inindo: Way of the Ninja (SNES), The Legend of Zelda II: Link's Adventure (NES), Tetris Attack (SNES)
So many great games, so little time and money