Stay away from a cheap $30 orbital buffer. Not only are they crappy in quality, but if used improperly you can jack up your paint. If you want to use a buffer, get a Porter Cable 7424 random orbital buffer. With a velcro backing plate and pads, you're looking at about $150. The difference betwen a PC and a cheap buffer, is that you really can't mess up your paint with PC.

If you don't want to spend the money on a buffer, just use a good MF or foam applicator. Walmart sells Meguiars pads for cheap. Also, get some good microfiber towels to buff off the wax.