I think a Peachtree iDecco would be a great match for you. It should have plenty of power for the Microwalsh's and it has USB input as well as an iPod dock. You'd have an extra optical, coax, and analogue input for additional sources in the future. Peachtree completely revamped their product line, so the iDecco isn't being produced any more, but they're still available from Amazon for just a bit over $800. I'd eventually get a better power amp, but the iDecco is great as a preamp, headphone amp, and DAC. I've used mine with Decware omni-directional speakers, and it sounds great. I'm now using it as a preamp and source going into a tube power amp.
NAD has some integrated amps that would sound great for your budget, but certainly don't have the DAC inputs for you sources. Same for the Jolida integrated tube amps. There's the Outlaw Audio RR2150 receiver that does have a USB input; it's another good option.
There are plenty of great options out there, good luck.
NAD has some integrated amps that would sound great for your budget, but certainly don't have the DAC inputs for you sources. Same for the Jolida integrated tube amps. There's the Outlaw Audio RR2150 receiver that does have a USB input; it's another good option.
There are plenty of great options out there, good luck.