Jennifer Hale is nice but I'm afraid Mary-Elizabeth McGlynn takes the prize for my Favorite Female VA.
Kari Wahlgren and Bridget Hoffman are also amazing.

For the guys, I really like Yuri Lowenthal, Dave Wittenberg and a bunch more.

Special mention to lesser known VAs - Darren Dunstan as Pegasus in Yu-Gi-Oh! was fantastic. 4Kids hate is dead and boring and that dub had pretty damn good people.