When you started listening to the BN, and you didn't know what the Brewcasters looked like, what image did you have in your head for various voices?
Here's mine...
Doc = Jeremy Piven
http://www.imdb.com/name/nm0005315/
Sully = Ian Gomez (Cougartown)
http://www.imdb.com/name/nm0327020/?ref_=nv_sr_1
JP = Seth Rogen
http://www.imdb.com/name/nm0736622/?ref_=fn_al_nm_1
Shat = Jonah Hill (fat version)
http://www.imdb.com/name/nm1706767/?ref_=nv_sr_1
Chris Graham = Drew Carey
http://www.imdb.com/name/nm0004804/?ref_=nv_sr_2
The others such as Justin, Daniella, JZ, Beevo, Tasty I googled before I had a mental picture. Though Tasty would be the Comic Book Guy off Simpsons.