Only route to take tbh..
The AT body setup offered by TDF (Track Group) is good value for money - K-Tecs kit is Jenvey so don't bother ordering the trinkets from Jenvey direct and get them from K-Tec as it works out more expensive otherwise. (if you sway that way)
Most importan thing with ITBs besides mapping is a decent filter solution, anything foam that doens't have a backing plate is normally a bit pants. Without starting a debate and going purely on what experience I had; stay the hell away from K-Tec if you are not going to install the kit yourself. I'm still trying to sort my loom out from over a year ago where they had bodged it and taped it together under my inlet.
TDF would be my point of call. Great service and don't half arse anything at all.
With regarding performance the AT kit is both DTH and has the shorter trumpets meaning you'll be able to fit a nice filter solution in there or if you're feeling fancy the carbon airbox Track Group supply with the kit (same as the burpspeed tintops car)
figures and drive wise, theres little in it between the kits, just make sure your engines healthy before you jump in.