I think you're in the same situation as I was about 2 months ago. I wanted to start racing again and didn't know what to go for. The thing you have to understand I believe is that 90% is the driver himself the car probably isn't the most important thing! I did as Gnarly just said and went to my local track and asked people what the were racing, how they liked it, what the pros and cons were. Some people were racing the Losi 22 others the B4.1 as well as Durangos and one Ansmann. Not one car stood out above the others. The drivers did however! So my advice would be to go to your local track, find a friendly face and get some opinions track side. Also ask at your LHS and see if there are any racers there who can steer you in the right direction. In the end I went for the B4.1 with the intention of eventually upgrading to the Centro. As I got some good advice from people at the track and my LHS.
I just need to finish building the thing now!