AC/DC and Maiden play it out for first place for me. 'DC probably just about take it when I listen to LTBR or BIB but Maiden would win in an overall contest. 'DC have just been so second rate for the last 25 years I'm afraid.
Motorhead probably take 3rd spot, closely followed by (in no particular order) Megadeth/Metallica/Anthrax/pre-Armageddon Aerosmith/(Ozzy/Dio-era)Black Sabbath.
This list is just going to include a lot of bands that have meant a lot to me over the years. Also my taste is hyper-eclectic.
1. Devin Townsend
2. Iron Maiden
3. Type O Negative
4. Modest Mouse (Hey now, I'm allowed to like what I like )
6. Queens of the Stone Age
7. Judas Priest
9. Strapping Young Lad
10. Bruce Dickinson solo