What system to match Merlin TSMM's?

Used YBA Integre amp and CD player come to mind. Also depends whether your speakers are wired to optimize w/ tubes or solid state.
If for tubes, in a small room, you don't necessarily need a lot of power. 25 watts of tube power would go a long way. Think integrated as well, no use going after separates in that price range.
Or if only CD, then a CD player w/ a volume control like Theta Miles into a tube amp, wold be nice. Check out Antique Sound Labs for tube sound on a budget.

I highly highly highly recommend talking to Bobby at Merlin. Tell him about your tastes, your listening habits, etc. He's heard all sorts of equipment with his speakers and he could probably give you several tube and SS choices in your price range. With that budget you might also want to consider an integrated amp instead of seperates...you'd probably get more for your money and you could save some cash on interconnects too.

Rogue Audio Tempest integrated (preferably the Magnum version) is one that should be on your short list...