Two very good points made above. I would say go for the cast version. This is your hobby and you just like me and every other nut out there is always going to upgrade. So I say get the best you can get for the money and build your upgrades around that. Yes there is a diffrence between the ksas and the fpbs the fpbs sound much much better. I had a ksa 150 which was a nice amp. Then I had a Levinson 331 Another nice amp Then I went to a Levinson 335 one of the best amps I have ever heard Now I have a Krell Fpb 200c and that is one of the best amps I have ever heard. Not as layered as the levinson but it sounds great. The Levinson had more space between musicians than the krell but the krell brings the music in your home.
Associated gear:
Krell Fpb 200c
Mark Levinson 39 cd player
Martin Logan Ascents
Harmonic tech. cables
Good Luck Email me if I can be of help
Associated gear:
Krell Fpb 200c
Mark Levinson 39 cd player
Martin Logan Ascents
Harmonic tech. cables
Good Luck Email me if I can be of help