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?