Yoko Shimomura did a wonderful job with the Kingdom Hearts OST, like many others have said, but I really love Yasunori Mitsuda's work for Chrono Cross.
Shoji Meguro does some really nice stuff but I think his best was in the Shin Megami Tensei: Nocturne game. Personally, my favorite track is Dante Battle.
Shivers up my spine everytime I hear this (which is often, I have the OST). Actually such an epic song.
There was also a period of time where I had no chance to play Skyrim for about a week, and I watched a video randomly on Youtube which had this song as background. I admit, I teared up, I missed playing that game.
SKYRIM AND HALO. but with both of them theres roughly 3 completely amazing songs to 15 not so epic ones. if you like more rock/metal ish stuff, halo 2 soundtrack has 2 awesome songs along that genre, plus another 2 calmer prettier ones. and needless to say, skyrim = classical type music.