Which calipers should I get?

In general, I agree with Rumblefish & his recommendations. I've had good experiences with Wagner, Raybestos, & Bendix products.

I disagree in part on his pad recommendations although the reasons he states are correct. Organic linings don't dissipate heat as well as semi-metallic. They tend to be a little softer, so I recommend them with un-assisted brakes. Semi-metallics are recommended with power brakes.

My personal favorites are Performance Friction Carbon Metallic. On un-assisted brakes these require a little leg, especially when cold. These are harder on the rotor than all of the above.

My only experience with ceramic brakes were on a Gulfstream G-III. Very expensive but very effective. After we became aware of how much better the brakes performed, we started flying into shorter fields. This caused them to wear out sooner. We noted much greater wear on the rotor than with carbon brakes we had been using.