I already have Sector 7 Hath Wrought the Angel, Sonik Elektronik, Project Chaos, Hedgehog heaven, Metroid Metal, and Relics of the Chozo.
I'm also searching for Samus Symphonic, I know that the site for it went down a while ago, and I was kinda interested.
I'd strongly recommend OCRemix.org's recent Final Fantasy VII compilation. Many of those remixes contain very good trance rhythms and metal scores. Other than that, there are a number of Metroid, Mega Man, and Zelda remixes on that site that are definitely worth your while.
I'll list some of my personal ocremix.org favorites.
Mega Man X3 House Hornet Mix - Beatdrop, mp
Zelda 64 Ocarina Boogie Mix - The Black Lodge
Super Mario Bros. Underworld Rock Mix - dimmer
Any songs by Game Over (on ocremix.org)
Steve Pordon's work
And that's it.
Almost forgot to list a few of my favorite remixes:
F-Zero Mute Radiology (one of the f-zero games)
TheDarkReachesOfSMW (super mario world)
Devestation's Doorway (super mario 64)