Those TM G4s are looking very nice. They have a lot to offer at a low cost.
I studied for a couple of weeks before deciding on one for myself. All you need to add is a set of suspension springs and a stiffer clutch spring, maybe competition brake pads and you're ready to race. (I got a TM spring set for only $25 and the clutch springs are $6.) Everything is already there, no hop-ups required, and it has one of the best clutches already included, too. I got mine from Winner's Circle RC, but Raceday has them for about the same price.
Also, the "team" is real open regarding setups. They are working real hard to be sure everyone who has one of these cars is fast and has a car that handles well. The G4S thread is full of hints and suggestions.