Oh man, I love video game music. I have a decent collection of soundtracks on vinyl and CD (mostly on vinyl tho) and listen to them quite regularly. It's so hard to name a true favorite but I'll post a couple that I really like that I can think of right now.

http://youtube;ya3yxTbkh5s

http://youtube;tITkTp83VRU

http://youtube;mOiMVDyYh8Y

http://youtube;Qq0eKI3mVUI

http://youtube;W5rnm4rwSL4

I could really go on and on but I'll leave it at those for now.