Check out the new BMW i8 Roadster!! It's got the top off without back seats and a bit more HP as well!!!
The new car has 369HP and 420lb-ft of torque, besting the last generation i8 by a sliver. The car still has minimal option packages and is easily configurable. The roadster is around 163k while the coupe is around 147k. Not cheap for either but the roadster is nearly 16k above the coupe's price! BMW still hasn't given the i8 the kind of horsepower that I think a car of this caliper deserves. The 0-60 times are still a tad over 4 seconds. It really doesn't compete with the M lineup. I guess this "halo" car will stun by it's looks only.
You can build you own car here.
As a quick note, please use appropriate language and be respectful in the comments section. Any misuse will result in removal from the comments section.