I was going to get the new 3.3 because of the 70+mph speed but I read that they are very hard to control in the forums. My hobby shop told me that the 4-tec is a very clustered chassis layout and you have to take half of the car apart to do any repairs or maintenance. Too much time!
I decided to stick with my HPI RS4 3 and got a new O.S. .18 CVR-X engine for it. I like it so far but I am still breaking the engine in.
Important thing is to know what to expect from the car and do research. And no matter what you get, have fun with it!!!!!!!!
I think that hook up RS4 is probably a wiser choice