Manowar is definetely my "feel-good band" with songs like Fighting the World, Carry On, Black Wind Fire and Steel, Wheels of Fire, Kings of Metal, Heart of Steel, Hail and Kill, Metal Warriors, Brothers of Metal, Fight Until We Die and the most uplifting song I know (always makes me feel good, cure for the worse day): Master of the Wind.
Yeah, I know, they're "gay" and yap yap yap... fuck off.
Edit: Forgot to mention Total Satan by The Crown, that song is cathartic!