You don't mention Budget or outline any plans for usage. I wouldn't cut any of the manufacturers short with out doin my homework first. By "Kit" do you plan on doing the build yourself? Are you going to autocross, show or daily drive the car?
as was said above, this is the first step on a great journey. But do your homework grasshopper. many times we here tend to give you answers as to what we would do. Not necessarily what fits into your plans.
BTW, don't forget to check out Factory Five !!
Oh I'd also check out all teh manufacturer's forums too. Lot's of good info out there. Good Luck and good hunting!