1) Einhander
2) Dracula New Classic (Orchestra versions of Classic Castlevania music)
3) Final Fantasy IV
4) Secret of Mana
5) Final Fantasy Tactics
6) Final Fantasy VI
7) Castlevania Symphony of the Night
8) The Elder Scrolls 2 - Daggerfall. You HAD to have a wavetable MIDI card to really get the most out of it though. Arena was great too.
9) Diablo - Not much, but man... great stuff. Too bad 2 was so... generic comparitively
10) Unreal Tournament '99 - Some great, timeless techno music in there
Oh, and Mechwarrior 2, and MW2 Mercenaries soundtracks. Timeless, TIMELESS stuff.
A lot of others I love too, but gotta draw a line somewhere. Good thread.
EDIT - WAIT WAIT, yes, ActRaiser. GOTTA AGREE THERE. BRILLIANT STUFF! Loved his work in Etrian Odyssey as well!!!