From the Futurama panel earlier today, Billy West actually already had that "cocky radio personality" voice down when he moved down to Los Angeles upon Phil Hartman's suggestion.

I'll get into favorites a little later.

Maurice LeMarche
Jon Lovitz
Billy West
Rob Paulsen
Steve Carell (Not there! THERE!)
John Michael Higgins (voice of Mentok on Harvey Birdman)

I Also Like Daran Morris, too.

Charles Martinet-If there's anything I like about him, its that he's a great choice to provide the voice for Mario (along with Luigi, Wario and Waluigi). I just which that Mario actually talk for once, instead of making grunt noises.

A few that I like:
Rob Paulsen- He is the awesome
Richard Hayworth
Ian James Corlett
Johhny Young Bosch- I met him! He was frightened by my crazyness
Eric Stuart
The lovely Veronica Taylor
Eric Vale- I stole his soda bottle when I met him :3
Vic Mignogna
Kirby Morrow
Dante Basco
Greg Ayres
Greg Cipes
Andrew Francis
Grey Delisle
Kelly Sheridan- I forgive her for being in the Barbie movies
Saffron Henderson
Brad Swaile _I'll love him forever
Scott McNeil- I love you
Brian Drummond- I'm sorry. I think he sounds like Scott McNeil and I confuse the two.
Terry Klassen
Christopher Sabat
Maggie Blue O'Hara
Tress MacNeille
Elizabeth Daily
Tara Strong
... and that's all I can think of right now. Sorry... the list wasn't supposed to be that long. I just started typing and it got out of hand. OH!
AND Justin Cook! Who I met and he was an extremely lovely person.

E.G Daily
Billy West (His voice for Stimpy (Ren & Stimpy) was HILARIOUS, and he used a really cute voice for Doug (show self-titled))
Tara Strong
Stephanie Beard AKA Suga BayBee
Veronica Taylor (Please do Ash Ketchum again for us!)
Hyden Walch (I love Lucky Star, and she does Yutaka, one of the cutest characters. She also does Penny on Chalkzone (unlike Tsukasa, I always found Penny annoying))
Julia McIlvaine (She does a bunch of voices on CN's MAD, and was also June in the underrated Nicktoon KaBlam!.)

All I can think of for now