Someone over at animeondvd.com forum got the DVD early, and posted the cast list. The dub is done by NYAV post, whose previous title include Magic Users Club and Knight Hunters.
Guts - Mark Diraison
Griffith - Kevin Collins
Caska - Carolyn Keranen
Corkus - Mark Sebastian
Judeau - Cris Kromer
Ricket - Michelle Newman
Pipin - Jeff Ward
Void - John Avner
Collette - Michel O'Medlin
Oldman/Minister - Richard Springle
Snake Baron/Merchant - Lex Wutas
Aide - Sean Schemmel
Dean - Daryl Bowling
Igole - Jeff Ward
Innkeeper - Jeff Swarthout
Bazuso - Patrick Transor
Mustached Baron - Robert Krakowski
Gambino - Robert Krakowski
Young Guts - Maria Dente
Kind of Midland - Jeff Swarthout
Adon - Mike Pollock
Yurius - Dick Blunting
Bosogn - Richard Springle
Gennon - Fred Velde
Gaston - Sean Schemmel
Guts - Mark Diraison
Griffith - Kevin Collins
Caska - Carolyn Keranen
Corkus - Mark Sebastian
Judeau - Cris Kromer
Ricket - Michelle Newman
Pipin - Jeff Ward
Void - John Avner
Collette - Michel O'Medlin
Oldman/Minister - Richard Springle
Snake Baron/Merchant - Lex Wutas
Aide - Sean Schemmel
Dean - Daryl Bowling
Igole - Jeff Ward
Innkeeper - Jeff Swarthout
Bazuso - Patrick Transor
Mustached Baron - Robert Krakowski
Gambino - Robert Krakowski
Young Guts - Maria Dente
Kind of Midland - Jeff Swarthout
Adon - Mike Pollock
Yurius - Dick Blunting
Bosogn - Richard Springle
Gennon - Fred Velde
Gaston - Sean Schemmel