currently using a PPM split front rig (2 more channels than the TT and 1 row higher - 4 vs 3) with the TT X harness. The PPM rig is priced a little lower than the TT rig - although you can't go wrong with TT, IMO.
Tend to get all of my stuff from
www.optactical.com. There may be places that sell for a little less, but their customer service has been "Sine Pari"
I recommend to all the guys and we've made some unit purchases from there.