Two tube integrateds that should (theory and practice don't always align) work would be an used VAC Avatar and the McIntosh 2275. Even better would be some more powerful tube separates that drive 4 ohms well (larger Manleys, VTLs, etc). While much of what Williewonka, says is true, you can imagine how good tubes must be to put up with all the issues he mentions. In this case, and at your price point I think SS is "proabably" the way to go, at least 100 watts.