I use Freetrack in my simpit and Track IR (5.0) on my desktop. Both work excellent. I used a very cheap Logitech IM web-cam purchased from Walmart for 19.99 but I did built a three LED headset. I have since built half a dozen more for other people (buddies that I fly with) and all of them worked very well for me. 25-30 fps is very smooth in freetrack, if at all possible; get a used or very cheap webcam locally and try for yourself before purchasing an expensive (relatively) PS3 cam. You might find that you are very happy with it.
There is a learning curve to using freetrack, mostly in setting up the curves, etc in the software. Building a headset/cap is not difficult at all if you have a little skill in tinkering and there are many videos on the web (youtube) that take you through the process step by step. I usually use a USB plug to power mine but I did build one set for a buddy using a rechargeable R/C battery pack that is velcro'd to the back of the hat that also works very well (R/C receiver packs are 4.8v anywhere from 800ma and up and are easy to charge while not in use).
In benchmarks, TrackIR is better, but in my opinion I cannot tell the difference while gaming.