New E-Maxx needed w/ GMaxx Chassis?

The stock E-Maxx was bought for my 8 year old son who was pretty abusive and now has a Rustler. I want to build a very nice project with little compromise. Cost is not very important other than the fact that I wouldn't want to spend so much that I would not want to run it hard. I would like to make sure that I can't break any really expensive parts like the chassis. I don't mind spending $300 for a new E-Maxx but - am I really going to use any of the parts? I'm mainly interested in driving the truck, not tinkering or building it for show. I would like it to go a little faster than the stock one did with 7 cell packs and would mainly go brushless for maintenance and battery life.

I was assiming I would buy the G2 Chassis for low CG and the G3 Suspension for durability, tunability, and handling. I was pretty disappiointed in the lack of directional stability of the stock E-Maxx but fixed most of that by moving the shocks out to the lowest ride height position, which dropped it 1/2" and going to Losi Zombie-Maxx tires that helped to get rid of most of the vices of a square cornered tire. Cornering increased so much that the truck now wants to roll even easier than it did before which I hope to "solve" by lower batteries and motor.

Thanks for the help!