What parts does your local hobby shop carry? If they carry Associated that makes it a more difficult choice. I would go with the Nitro Rustler because it has better electronics than the RC10GT2. IMO Team Associated has always had a problem with their electronics.
go with the rc10gt2. I have had it for almost a year and it is very good. It is built well. I don't know what people are talking about saying the electrics are bad because they are very good. Comes with the xp2 radio which is really good. It is very fast and durable for bashing. Plus team associated is a good company.
if you get a traxxas engine do NOT run it at top rpm for more than 4-5 seconds. else you will be in the split con rod club. of course break it in first. i have found that driving slower is still lots of fun. before you start it put a SMALL amount of marvel mystery oil in the carb, exhaust, glow plug.