Inexpensive integrated for Usher S-520

I'm putting together a system for a small bedroom that's about 11'x12'. I've owned the Usher S-520 before so I'm pretty familiar with them. What integrated amp under $500 (new or used) should I pair them with? I need a remote control, and I want to stay away from tubes. I'd be interested in trying out one of the class D or tripath based amps, but not sure if they would match well with the inefficient Ushers.

Integrated amps that I've been considering are:
Onkyo A-9555
NAD 325BEE
Cambridge Audio 540a v.2
PopPulse T70i

Any other recommendations for the Ushers?