Don't get a TC4. It's not a really bad car, but its not got the edge that the T2 or RDX have. The build quality is considerably worse too. To build a tc4 perfectly would probably take you double the time of the other two you mention.
I'd get the T2. There's little between it and the RDX, but the Xray is slightly cheaper I think and the RDX apparently has fragile wishbones and shock towers. I bought a TC4 FT and I'd swop it for a T2 on the spot.