Best choice for small form Amp for desktop

Need to redo desktop setup so have to downsize Amp. Looking at used small form integrateds from Bel Canto(5i), W4S (mInt), Peachtree and a few other Class D units to run Spendor S3/5 monitors. Only 85db efficiency does mean I'm looking for 50 or more wrms. Haven't heard any of these but I know some of these use older ICE modules. Does that mean lesser performance? Should I focus on newer  executions? IM looking at spending $1k or so as this is a  more peripheral system. Appreciate input or suggestions on other brands too.