I don't often say this to people, but I say go with the TC3. But, you do know that there are many, many other options out there. Losi, Tamiya, Corally, XRay, Yokomo, and many others make good cars that you could consider.
Don't worry about what everybody else runs at your track. If you need advice, this board is only a few clicks on the computer away. Arm yourself with info about setup and whatnot BEFORE you head to the track, and you'll be fine.
Dont worry about what parts the local shop carries either. Unless your driving a piece of junk, you'll know what parts in particular you need to have extras for. Theres usually only a few weak points on any car. Its a good idea to keep extras in you box anyway, whether the local shop stocks stuff for your car or not. Heres a thought, what if their out of what you need or you just happen to be broke(money wise) that night? So keeping extras of what you need just makes sense.
Besides, I don't care WHAT car you drive, between the car, electronics, tools and other equipment, no local shop can carry everything, so you will end up ordering SOMETHING at one point or another. So don't buy into that stuff about getting the car that the local shop supports. Find a car you'll like and feel comforterable with, find out whats the weak points on that particular car and get extras for those things and any other things you think might give way.
I have never run a car that the local shop supports, and have never been caught without the part I need. Because I have sense enough to keep extras.
So don't limit your options. Keep your mind open to all cars.
And of course, good luck with whatever car you choose.