When I was in the US military, stationed in Okinawa, Japan, in 1983, I bought a Luxman L-580. Best integrated solid-state amplifier I have ever heard. Still have it.
http://www.thevintageknob.org/luxman-L-58A.html
The above is the Japan-only version. The L-580 sold for US use had different script writing for "Luxman" and also had LED power meters.
I've got an L-480, it's quite nice.
My Pioneer A-71 (A-858) is my favorite integrated amp. Has a few cool functions such as the DSD setting for direct mode, good Phono stage, just a well made amp.
The Natioal Panasonic Integrated amps tend to have a nice sound. Have a SU3100 (I think that's the model), one of the best sounding vintage amps.
The Onix A-60 or A-120 (good luck tracking one down)... sold mine off a while back, never should have.. fantastic sound stage, simple and classy amp.