I have a gallon through my NX and have had no problems with it. With some preventative maintenance and proper gear mesh you should have no trouble. The only time mine has broken is when I let someone else drive it.

However, if you are considering club racing I would go with the 1/8 scale buggy or truggy as they are more popular at most local tracks.

Even if bashing is your main activity I would recommend the 1/8th truggy, they can take a lot of punishment.