Sonic Frontiers Line-3 should work.
I have owned the Sonic Frontiers Line 1, and in my opinion I find it to be quite neutral and not warm-sounding. In fact, the sound was rather flat across the spectrum. Tubes used were Sovteks and Amperex.
If you want a warm sound, I would suggest that you look elsewhere other than Sonic Frontiers and ARC, which I currently own.
Sorry, I was mistaken, I'm confusing two Marsh preamps, the balanced and the tube versions. The tube pre doesn't have either a remote nor balanced outputs.
The balanced preamp, has both balanced and RCA outputs, but is not a tube preamp. However, and this is important, it does have a tube-like sound. It's a great preamp that sells retail for about $1500. You can pick it up on ebay for around half that. And it DOES have a remote that controls both volume and balance. I recommend looking into it. I own both, and friends tend to like the sound of the balanced version.
I recommend: Audio Experience ( YS-Audio ) Balanced A2 full balanced line preamp .
It sell at AudiogoN for USD$988.
Full balanced design and full tubes design ( 12AX7 x4 , 5686WB x2 )with Remote Control .
Also, it has two pair XLR output / RCA output and one pair Processor input with Home Theater Bypass loop (HT/BP).
All input and output both with XLR and RCA.