I picked up a 100 watt into 4ohms Class D board amp and a Meanwell power supply a year or so ago and it's been great. Listened to it tonight driving my bi-amped garage OB's. Sweet!
To get the most out of one you really need a tube preamp up front. I use my Aric but a cheap one off ebay would be fine. Arjen Helder sells a good one..
Video: Class D Amplifier boards