Marshall JCM 2000 DSL 50 - $750 (includes footswitch and a set of brand new JJ KT77 tubes).
Excellent shape. Looks and sounds great. Just check the HC reviews and do a search about how everyone feels about this amp. I just picked up a Boogie so I don't really need this amp anymore. The KT77's are supposed to add more headroom and give it a thicker sound. Never got around to installing them because I got the Boogie shortly after.
http://images102.fotki.com/v400/phot.../dsl50a-vi.jpg
http://images22.fotki.com/v835/photo.../dsl50b-vi.jpg