Casey is correct.

The TXT-1 would be great right out of the box.

The Clodbuster will require a cantilever chassis kit that will add 250+ to the price. But you will end up with a class A+ truck.

If you wanted Nitro look into the Mega Force by Kyosho, or the XTM nitro monster.

For rock crawling you want a solid axle setup first off. Independent suspensions (Tmaxx, Emaxx, Pirates, etc) are not good for a lot of suspension articulation.