Does such a beast exist?

The nuforce sounds interesting. For about $200 more you can get the 50WPC integrated, It has no balanced outputs, but being an integrated, I could get rid of my monoblocks and simplify my rig. I don't really want to part with my amps, though. Luminous Audio sounds like a good idea. I think I'll email Tim and see what he has to say. I also noticed that Goldpoint Audio makes a small passive pre with two balanced outs. I could use an adapter to convert one to SE to drive my sub.

Thanks for all the replies,

Electra-Print, Space Tech Labs, Goldpoint, and Welborne Labs are some other options. All are passive designs and can be customized to meet your needs. Well within your budget too.

I second the Nuforce P8. This is a raging steal with no teething problems one might associate with a new product from a new firm. Incredible value.

Prpixel, I have the p8 and it has R L pre out. I use that for my two jm labs subs. It also has a home theater pass through on input 3. This works perfectly for my setup. I have an Arcam AV8 pre/pro that is a good 2 channel performer but the p8 is leagues above.

Linn (LK1)