I've heard great things about the Bugera V5. It can run at .1W for headphones, 1W for nice overdriven tones in the bedroom without bothering everyone. and 5W to jam or drive the optional 4x12's or mic it to a PA. I do not have one, but have been admiring them from afar.
http://www.bugera-amps.com/EN/products/V5.aspx