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DanP said..
My 2c.... you dont need one.
There are some unreal No-Cam free race sails around. Severne NCX, KA Koyote, NP Hellcat, North E-Type, Ezzy Cheetah etc etc etc. They are just as fast, stable, much simpler to rig, just no fuss all round fun, speed & performance. If you match them with a quick board/fin combo you'll be laughing. Unless you are doing full blown racing, or speed sailing - I wouldnt bother.
FYI - I have 7.5, 6.5 & 5.5 NCX's and swear by them. I'm just as fast as anyone else on the water. My only cammed sail is a 5.0 koncept that i use when its nuking at the PiT or Lake George - a couple of times a year.
Depends what your purpose is. If you are just wanting to cruise and go a bit faster then a no-cam sail is fine. However if you want to push the boundaries a cam sail is more stable and enables you to be confident when overpowered or racing.
Yes a good sailor can be as fast as majority of sailors on a no-cam sail but if you want comfort and speed easier a cam sail achieves this much faster.
A 2-3 cam sail would also be better if you are just getting to that level. Full race sails are great and necessary when wanting to go as fast as possible easily :)