Glad you're enjoying the Prime Scout and other recent additions! As for amps, perhaps give something from Atoll Electronique a look. I recently heard their IN80 while auditioning my Fidelio (speakers), and it showed up my Moon 240i. Both were smooth and detailed, but the Atoll had noticeably more body and presence by comparison. I was impressed.
The IN100 Signature is probably where you'd want to look at a $2k budget, though I can't seem to find exact US prices.. It has home theatre bypass and a dual mono design, as well as 140 watts into 4 ohms and reputedly iron-fisted bass control, which might benefit those Luminas.