If you want the 24p look you should shoot in 24p, it makes no sense to do it 60i. The conversion will never look as good plus it adds a lot of render time, and it is easier to go up to 29.97 from 23.98 if you need to later.
720p @ 24p (23.98) gives you the most versatility since you can do the speed adjustments in camera. You also get the longest record time (24pN). The key is to pick one format and stick with it. It is also very easy to cross convert the project when completed, so if you shot in 720p and later need a 1080i master all you need is a system with a Kona3 card (or IoHD) and it will spit out a 1080i (or other way around).
Even though the camera can do doth i kind of think of it as a 720P camera,
My 2 cents.
Oh, if you don’t have it get Barry Green’s book on the camera, it is a must have.