There needs to be a sticky, titled along the lines of before you post a "which car should I get" thread...
It's been said sooo many times (and it's true), the Xray is tough. It can be plowed into solid objects and seemingly shrug it all off. Want strong? Buy the Xray.
As for all other cars.... What does everyone at your track run? What does your LHS support? Which color gives you the warm, fuzzy feeling? How different do you like to be? What is your budget? Because they all work and if set up properly they can all potentially win. That basically covers it. I've seen Awesomatix cars do very well. I've also seen $100 Sakura's do very well. If you're still learning (as I believe most people starting these threads are) then stick to what is popular locally so you can get help and pointers.
Oh, and yeah I'd say get a T4.