Wouldnt recommend a car that has no parts support or anything coming soon. Your better off looking in the direction of a Serpent, Mugen, Kyosho, Xray or if you need something economical, Team Magic's G4JS version.
But if you want your question answered, in my opinion I would go with the HPI R40... always have seen it as the strongest heaviest car in the racing market.
eBay user id: riketsukirai
Selling all my MTX4 parts, bodies, radio and everything!