I owned the Response 2.5 in the past and I think they need a bit of power to perform due to the low sensitivity. I had them paired with Quicksilver V-4 amplifiers which would be a bit over your budget ($2.5k)
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For many years I ran my 2.5s with a 12W Cary SE Class A tube amp, and was very, very happy with the result. This was based on a recommendation a long time ago from Arnie, the founder of A-gon, when he still ran a B&M store, Accutronics, in Ann Arbor (so many As...). These days I'd be inclined to look at whatever PrimaLuna amp you can reach with your budget.
If you listen at low volumes you should be able to use an RM9. I owned the original back in the day and they’re lovely, lovely sounding amps. Or you cold go all CJ with something like this: