1. Chillpenguin stage music from Megaman X (really!
)
2. Anything from Master of Orion 2... well, except the Bulrathi music, that's soooo boring, has like 4 notes...
3.... ummm, I dunno... but there's this really cool remix of the Megaman 4 boss music at vgmusic.com which might work for combat...
you can tell I really like video game music