If it wasn't for the light to moderate offroading needs and price under US$1000, I would continue to suggest the modified Brompton since it would offer you the BEST FOLDED option.
I am more inclined to suggest a Downtube (if money is an issue) or a custom Bike Friday (if you have the super power of unlimited budget). Whatever you do, the final product will be quite unique and we ask as part of the natural laws of retribution, lots of high quality pictures focusing on every single detail/changes made.
Once again, good luck on your final decision.
I second this opinion. I'm up in Seattle and have no problem with rim brakes (drum dyno would be nice). Bike Friday would be another nice choice. I don't think the'll do discs on the fork of the Tikit, but discs on a l
Llama would be nice.
Good luck and report back when the dust clears. I'm interested to hear what you end up with.