That depends on what kind of wheels you have.

I actually asked Martin whether he could do a 330 mm brake kit with the standard calipers (this kit). The reason was that my wheels don't give much clearance for the calipers (a standard 4x4 issue). In the end the 330 mm was even to big, so I went for a 320 mm kit.

If your wheels give enough clearance I would go for a 4 pot caliper setup.