My personal is (I played a lot of the older ones) 1) Touch and Go 2) Staff Roll Tekken tag tournament ost 3) Pave your way (however I enjoy Vincent Moretto Metal remix even more guitar) Honorable mention: Kitsch (Tekken 4 beach stage)
"DUDE, WTF?? HOW YOU ARE SO BUFFED IN JUST A WEEK?" makes listen to this "makes sense" a week later: *HALF OF THE GYM IS BUFFED AND EXPELLING ELECTRICITY*