If you are looking at the ofna's, the hyper 7 is a good starting buggy. They also have a new Picco buggy but I don't know much about it. CEN is excellent also.
If you want a truggy the the OFNA Truggy is good but a little more $. Cen also makes a good truggy. Robitronics also has a good one for beginners.
www.amainhobbies.com
www.towerhobbies.com
www.nitrohouse.com
or better your local hobby shop.