I must ask though... do you have enough clean amplification to reach your listening level goals?
I have the stereo version of this, built pretty much stock:
http://chipamp.com/lm3886-amplifier-kit/
A new amp is something I'm also considering for a little down the road, probably tubes for variety's sake, but I'm open to anything. I've always had the feeling though that I was running out of speaker long before I've run out of amp.