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...
No, not unless you think you would get 1.5 k worth of fun just listening to a slightly different sound. If it sounds good now, it is good.