Do not be so quick to quit using Freetrack with your existing camera.
I bought a TrackIR 4 system and guess what I use most of the time!
FreeTrack and TrackIR Pro Clip with my webcam.
Many games do not have TrackIR mouse emulation.
Read this article about my disappointment with TrackIR;
http://forum.naturalpoint.com/forum/ubbthreads.php?ubb=showflat&Number=48406#Post48406