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For the easiest on the rear go with the early 944 ventalated disk brakes on the rear. You can use the 901 (bug) or 915 (thing, early 944) cvs and stub axle. The only pickle is matching up the emergency cable. There has been numerous threads on that. If you don't want the Porsche pattern or just need the bug pattern for your lugbolts, just go with the solid rear rotor CB kit. To be honest the whole Porsche brake thing may be way overkill unless you race alot. Since the fronts do most of the work they are the brakes most likely to over heat. Major improvements on the rear to solid disks would be using slotted rotors and cooling ducts. This would be a high performance rear brake without a lot of the hassle and expense of adapting something else.
For the front the CSP rotor, disk is the easiest. It also has any bolt pattern you may want. The reason I have had so much fun with the front adapters is that I wanted to make a commercially available kit which is somewhat universal in that it can be easily adaptable to different rotor, spindle, caliper combinations. Basically all you would need to worry about would be the rotor diameter, thickness, and the bolt pattern for the caliper. A mill would be required to precisely locate and drill the holes and to adjust the thickness of the adapter to center the caliper on the rotor. This is also the lightest combination for the cost. A lighter combination would be to adapt the Porsche hub or have a custom hub machined. Both much more expensive. Using slotted rotors and air ducts would also make big improvements.
Here are some pictures of a completed assembly.
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