I would definitely consider the Sonic Frontiers SFLine 2. You can go to the Sonic Frontiers website (Anthem.com) and find all the info. you need. It's a tube pre. incorporating six 6922 tubes, no power tubes, SE and XLR, and seperate power supply in a small chassis. If you have the room, and can find it for a good deal, try the LINE 3. It has 10 6922s and 2 other tubes I'm not sure of. It also has a seperate power supply, but in a full size chassis. Make sure you get the LINE 2, it has the famous puck remote.
You should also look at B.A.T Balanced Audio Technology. I don't know as much about them, but my brother has a VK-3i.
You should also look at B.A.T Balanced Audio Technology. I don't know as much about them, but my brother has a VK-3i.