Just do it. Get a Shockwave. It's a good car, good price and will be he easiest to deal with as someone that is starting out in nitro.
I have one, I love it. I also have a $300 1/8th scale Avilanche, I like it too, but honestly... I find the Shockwave to be more fun. It can speed around a parking lot doing donuts and hook hard turn a lot easier than the Avi.
You can always upgrade it later if you want. I put the Tornado motor and two speed tranny in mine. Even with the speed and power that it has now I have never flipped it on a flat surface from turns and such. Grassy, bumpy dirt areas are another story.
What I am trying to say is that it is very stable.
Unfortunately it currently has to be rebuilt. A friend 9 year old daughter drove it into a concrete barrier at full throttle. It broke one shock, a C hub, a steering nuckle, bent the shock tower, bent the chassis, broke a wheel and scraped a chunk off of the bumper. Not bad concidering how hard it hit. We found the front dog bone about 15 feet from the crash site.
So it;s getting rebuilt with aluminum steering parts and carbon fiber shock towers.
"Gentlemen, we can rebuild him. We have the technology. We have the capability... "