i cannot possibly have one fave. but i would say the top ones are:
Duncan Sheik
Tears for Fears
A-Ha
Nirvana
Pink Floyd (though its a little overplayed)
i really dont know, there are so many, i recently became aware of TOK's fav, Deftones, and i love them....
....also didnt know much of NIN's stuff till recently, and they're great too.....lots of favs
a more recent fav of mine is Three Days Grace....their lyrics seem to say alot of how i feel sometimes...and Linkin Park has a style that i totally go for, although they are overplayed and a little repetitive