Thanks for the opinions thus far. It really is helpful.
This seems to be the trends I've been hearing (some not mentioned in this thread, some from personal experience):
Superformance - Great roller, but may be too expensive.
It seems like few can get these built for under my $100k limit.
ERA - also an excellent kit, but also too expensive (> $100k)
Tornado - A well liked space frame kit, been around for years, good customer service, and fits right in budget.
RCR - Aluminium monocoque, excellent reputation. I believe they are a new company, and their first gt40 rolled out on 3/3/07 -- so not sure about customer service / support / etc. Looks like this fits right in budget too. However, I have as of yet been unable to find any interior pictures, or learn about A/C.
Any comments on these? Tornado and RCR, based on budget, seem to be the front-runners.
Thanks,
Scott