JackD - I actually had also considered the Cayin. However, 2 problems - one, it still doesn't have a regulated line out, and 2 it sounds from the reviews that it may be a bit bright and revealing. That's not the type of sound I'm looking for.
Chewbacca - that does look like a sweet little amp. Still though, no line outs. It seems that the Doge 10 is the only integrated tube amp under 2k that has that feature. The next one I can find is the PrimaLuna Evo 300. That's kind of the reason for this thread - if I don't need to care about the line outs it opens up so many options.