I'm rather partial to
The song that Vile mentioned above,
is pretty good too. (Better than Dr. Manhattan's Duality anyway. )
And how can we mention Repliforce without this?
It's a shame they took down some of their older albums... "Intense Gameplay Action" (IGA) and "Nothing Can Stop Us" (NCSU)
I still have those two albums so I'll post them up sometime for people to take a listen to. (Since I sort of like the older version of The Warrior Through Time found on IGA.)
EDIT -
Here is the album "Intense Gameplay Action" for download.
Here is the "Nothing Can Stop Us" album for download.