If you're comfortable with DIY, look at the Tubes4HiFi PH16. I have one with a custom built chassis and integrated sut and it's fabulous. Definitely scales with upgrades in parts as well.
Other options I've heard that are nice in that range is the Parasound JC3 Jr. Good detail, very quiet, but a little flatter in presentation. Could have been my friend's room though. Should be able to find a used one in your price range.