A nice set of scubapro regs, I'd go for.
e.g. MK25/S600 if you're feeling flush
As for BP/wing, dunno. I bought a Scubapro Glide 2000 a year ago on the basis that I'd certainly not be diving twins for the next few years. Here I am with twin 12s, an OMS wing, BP + harness. And the Glide is stuck on the shelf
