BMW 1M vs Porsche Cayman R vs Audi TT RS: Which to buy?

The new genre of "lower-case halo cars" — specifically the Porsche Cayman R, BMW 1M and Audi TT RS — are pricey, but they've got their priorities in the right place, with nimble handling, supercar acceleration and manual transmission only. The question is, which one would you buy? » 10/20/11 2:00pm 10/20/11 2:00pm