Are you getting them for looks or because you're actually running up against the limits of the stock brakes?
If for looks, I'd say spending $2K to have slightly larger brake calipers is ranks high on the list of things humans do that I don't understand - but these are probably the cheapest way to do it.
If you actually need better braking, I'd go whole hog with the 6-piston AP kit or else go with the Brembo upgrade calipers (which are the same price as those rotaras). I'm personally taking it easy on the track until someone comes out with a decent two-piece rotor, and hoping that solves any problems. Since I'm tracking for fun, not to shave seconds off my time, that solution will probably work for me. If I were really chasing lap times, I'd follow Travis' lead...
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