The sound devices USBpre 2 is very impressive. I bought one two weeks ago, and I'm quite happy with it.
This is really great gear, very well engineered, and capable of doing a million (or at least a dozen or so) more things than would ever come immediately to mind.
It's not just a box that does what it does, but an extraordinarily well thought out and well engineered box. Its pedigree shows in every aspect of its function and build.
Well worth a very serious look.
And BTW, it sounds great!