Im sure Ive posted here before, probably several times, so lets see if I can contradict myself
I suggested Cillian Murphy's name as a possible Fool from Robin Hobb's series and I had forgotten how flawless Torak was meant to look.
With the right set up to make him look more impossing he might make a good Torak.
I think Patrick Stewart is a bit over exposed to be in any more SFF movies/tv at the moment, which is shame as I think he'd make a perfect Vanion.
And Bill Nighy as Zalasta is a great suggestion.
Barak - Ron Pearlman (The guy in the Hellboy suit)
Sean Connery is probably about the right age to play Belgarath and Im sure he could get the attitude right, I just always pictured him thinner?
Viggo Mortensen would work as Sparharwk but as with Stewart its maybe too similar to a previous role.
Giovanni Ribisi (younger brother in gone in sixty seconds) for Relg.
He might be too old now but Oded Fehr (The Mummy, Deuce Bigalo) would have made a good Hetter. Maybe Asharak now days
.
Actually, Sendhil Ramamurthy (Mohinder in Heroes) might do ok as Hetter.
and speaking of Heroes, Greg Grunberg for Durnik? he's got that strong/nice guy sort of look.
Jennifer Connelly would be perfect for Polgara IMO
I wonder what Mena Suvari would look like with wild curly red hair?