Thanks for all the great info.
I was going to try and pick up a used 702 or 722, but the USBPre 2 -> DR-680 sounds like it may be a winner.
I'm very good with my gear so the plastic build should be good in a good bag with some light reinforcing for the panels.
However, if anyone on the board is willing to sell a 702 or 722, as well as an MKH 416p, I would be happy to pick it up.