Research is the one think I'd advise anyone thinking of starting or returning to racing. Visit their "Club" first to see what everyone is running.
The "Cat" seems to be the "in" thing at the moment...I bought the 501x after finding out that the Top drivers had it as their car of choice when I first visited the CVMCC. I got to find out their settings and found my way into the "A" finals occasionally.
Now this 501x, 6 set of cells and a Muchmore balancer can be picked up for just under £200.00...less than the Lipo "Cat" I recently changed to!
On the other hand "Rob", my "team mate" from quite some years ago has been, once again, bitten by the "bug" and has returned to racing. He bought all new, car, esc, lipos, charger and radio but from previous experience will be up there at the top end of qualifying in a week or two.
It can be an expensive sport and it all depends on how deep your pockets are or your determination to succeed within the club.
The one thing you can't buy is the, natural ability to control an RC Car