All those options are good I think. The biggest priority for me is experience with the material. If I can't get through to DeSalvo, I might try and go on the Firefly waitlist. In the case of Bingham, I really can't deal with the brand at all - other wise I would love to buy from him.
The appeal to me about DeSalvo is the quality of the welds and the curvy seat stays. And the price. I basically want to get a ti bike that looks and rides like a speedvagen og1, but without the integrated seatpost.