high quality amp

I built the Pass ACA and the F6 and had great help / support from forum members on the Pass site. Now I'm interested in building a high quality Class D power amp, preferably with balanced and RCA inputs if it exists, wattage in the 150 RMS or higher range per channel.

Any advice on kits/suppliers etc is appreciated.

The amp will run Harbeth HLS 5 Plus Supers, a REL sub and be driven by a Pass XP 10 pre.

thanks