Belles 150A or keep current amp


I use Vandersteen 2ce speakers with an old Krell KST 100 amp, YBA 2 preamp in a 10 x 12 room, modest volumes (85db nominal, 95 db peaks) playing mostly jazz. I received the amp with all cap replacements for free from a cousin. I've heard better but is it worth it to drop $1K - 1.5K on an amp,say a Belles?
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It's a co-op in Manhattan, you have to pay for a large room and if you did you wouldn't be able to afford any stereo equipment.

The 2ce are from owning a house and being disabled puts equipment purchases low on the priority list. This is the first piece of equipment I've considered since the early 90's.
Belles is a good amp but wouldn't be my first choice since it's warm sounding, similiar to the sound of the 2Ce's. I've read McCormack is an excellent match...