Stimpy, I'm afraid that you have "out grown" the Crossfire, physically. I'm 6'2" and I think even 6'4" would be pushing the envelope.
As Spensley pointed out, the roadster does indeed have more head room, even with the top up. But I don't know if it's enough to accommodate your height.
Try them both on for size, even the base model. (It has a cloth seat instead of leather, but it probably wouldn't make any difference).
One possible solution may be having the legs of the drivers seat "shortened", but I don't know if it's design lends itself to such a modification or not.
I hate telling anybody to forget about a Crossfire because they're so much fun to own. Sorry.