Guilty Gear ranks up there as having one of the best soundtracks in my opinion.
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1. Kh 2 ost
2. Kh 1 ost
3. Devil may cry osts
4. Mgs:revengance ost (some songs)
5. Ddr osts (way too many to list, and I only like a few songs from each version)
6. Xenosaga ost
7. So sue me, but the secret songs from the cod zombie games.
8. I don't know if it counts, but ff7: Advent children ost. Ff is a video game series, at least.
9. Need for speed underground series and the old midnight club osts.1