Any GREAT "sleeper" amps?

Go straight for Nikko amps.
They're built for life and do a very great job for bellow $500. Their power rating varies depends on the model from 100 upto 400Wpc. One downside is that many of them wouldn't drive speakers that go bellow 4Ohms.

I enjoyed Arcams Alpha 10 (about 100 wpc if memory serves) in both integrated and power amp versions. Don't know if the used Alpha's are going at what you'd call a steal though. Good Luck!

I wouldn't exactly call it a sleeper, but I would call it a classic that has IMHO been very hard to beat.

http://cls.audiogon.com/cgi-bin/cls.pl?ampstube&1145045928

You could do FAR worse than this amp...

Oz

I am partial to tubes, but the old Dynaco mark 3's are really nice if you buy them after the caps and tubes have been updated.

Thanks, sugarbrie. a little humor goes a long way on this forum!