Here is a list:
Academy SB Sport, RTR, or Pro Model
Losi XX-4 Worlds Edition Rerelease
X-Factory X5 full kit
Tamiya Gravel Hound
X-Factory X5 conversion for XX-4 and XXX-4
There may be more but those are the ones I know about. Yokomo also has a buggy in the works and Academy will have the new SB V2 out in the spring.
I would recommend that you review there features, make a list of known issues and pick from there so you can make an informed decision.
Right now, I would say the hottest buggy on the market as far as flying off the shelves probably would be the new Kyosho ZX5. For the money,you get alot of buggy in the package including that oneway setup which usually is extra dollars on the other buggies.
The Predator vehicle on one site has a pretty good deal going on that you get a really nice ESC and the buggy for I think around $500? not sure how much the ESC is worth, but it says it retails for $169 and has no motor limit.
If you are wanting to get in cheaper, the Academy SB Sport and RTR are nice packages, and with a few upgrades with still keep the vehicle under $200 you can be all set. Ultimatehobbies sells the vehicle for $145 shipped last I checked and the Pro version for $224 shipped.
Wheels between the Kyosho ZX5 and Academy SB should be compatible as well.
< Durango DEX8, DESC410V2, DEX410V5>
< Team Associated RC10B6D>