Pass aleph-3 or BAT 1001 MK2

They didn't stop making the Aleph line for no reason. Look into the Electrocompaniet AW60 FTT or the AW 120 DMB amps. Both are better candidates than the ones you are considering. They list for 1995 and 3995 but can be gotten at less.

Try to listen to them in your system if at all possible. I haven't heard the Bel amps, but the Pass Aleph 3 sounds great in my system. If you have efficient speakers, listen at less than deafening levels, and your system can resolve subtle details, you'll really appreciate the refinement of the Aleph 3.

The Clayton Audio S40 (50 watts per ch) or their more powerful monaural amps the M70s (70 watt/ch) and the M100 (100 watts/ch) should be prime contenders in your search for amps in this category. Several well known audio-folk have replaced their BELs with the M70s.