I second the Cary SLI-80. It's a flexible amp in that you can use KT88's, 6550's, El34's, etc., plus is has triode and ultralinear modes that you can shift on the fly. Plus is has subwoofer outs that many amps are missing and it has a great headphone out as well. Used Sli-80's show up regularly in the classifieds within your budget. Although I have not had the good fortune to hear the Jadis Orchestra, I'm sure its a great choice as well. IMHO, few integrateds exude class like Jadis and I hope to own one one day.
Best Tube Integrated
I'm looking to experiment with a tube or tube hybrid integrated amp. I don't really want to exceed the $2000 used range. I currently own a Krell KSA 250 and I'm running Dynaudio Contour 3.3's. As you may be able to tell, I like big output with a lot of bass. I realize that tubes probably won't give such bass and output but I just want to find an integrated that's known for having some juice. The main thing is I just want it to be warm and sweet. Any suggestions?