Whats wrong with the Jacuzzi/Energizer set-up? Even if you replaced the bowl, impeller/wear ring and front bearing, it shouldn't run ya a grand. performance wise I don't think an 'all Berk' set-up would be any better, just more expensive. the back half of that pump is already 'Berkeleyized". We need to see some pics of the carnage to make an informed decision.
What hull do you have?
Dan'l