There's a pair of Meitner 100-watt Class A monoblocks for sale right now for $599 - that's killer. I would personally go for a 45-watt or so used tube amp, maybe the little VTL or a JoLida (the JoLida hybrids are very musical also, if you want a bit more bang for your buck). There are a couple of little Music Reference amps for sale - less power but very good sound. If you lean towards a Golden Tube amp, ask the seller if it's noisy - some of them are.
