Absolutely love music myself, so hopefully my suggestions will be interesting to check out 8D. Just to throw out the contemporary stuff to suggest; Soundgarden, Led Zeppelin, Alice in Chains, Queen, The Who. Now those are out of the way, let's get in deep.
Karnivool - Australian band, sorta like TooL, only more melodic like vocals focused? Anyway, I'm sure you'll like them if you like TooL.(huge fan of TooL myself)
Also check out "Setting Fire to the Hive", "Umbra" and "All I Know."
Twelve Foot Ninja - Yeah, Alt-Rock with some metal undertones and some really interesting riffs.
I'd also suggest "Portrait#1", "Dark Passenger", "Coming For You."
Kate Bush - for a more "poppy" and easier listening sound, Kate Bush is good. her vocal style is very good and not at all you expect.
I'd also recommend "Babooshka", "Wow", "Breathing."