Well, bottom line for me is base or fully loaded, the 135i is going to be $7-10K more, either way you look at it. The camero is just too heavy, and I can only imagine how much the dealer mark up is going to be in the SS version, prob the same like when the new Mustang Cobra came out.
I know this car wasn't mentioned by the OG poster, but I'm thinking the new 09 Z4 coupe will probably be the better one to compare to the Z. They are both 2 seaters and similar wheelbase, etc.
It will have the same 300hp motor as 135i, will be lighter, and base model about the same price. I'll bet that this will be one of the better performing/handling BMW's in the whole line, with the exception of some M models. It's sceduled to be unveiled around Dec 15th.
For me, it's the 370Z save my 8K for suspension upgrades and a twin turbo kit
Braden