+1 Black Ice Audio Fusion integrated in your price range. I've had the RF-7 in my home and also found the Fusion F22 with EL34 output tubes to be ideal. I even ran my DIY SET 300B monos (8W); no problem driving these speakers to high levels in a fairly large room. The nice thing about the Fusion F22 and F35 is that, with the built in and easy to use bias meter, you can roll in EL34, KT77, KT88 or 6550. I've been playing around with quads of Gold Lion KT77 and KT88 I purchased from Jim McShane on my F35. You can't get this variety of sonic and power output options with any solid state amp.
BTW, Black Ice is raising all their prices by 20% on March 1, so if you're on the fence, this would be a good time to pull the trigger.
Good luck.