All 8th scale buggies are 4WD, including the MBX. For your budget, the two you listed are about the only choices. Both are fairly durable buggies, and if you are new to nitro, will be plenty fast.

Try using the search button in the upper right corner of the screen for more info on this topic. It has been discussed before, and you should find a wealth of information here already. Good luck, and welcome to 8th scale.