you can actually find the Hyper 7 TQ RTR new on ebay for around 300... very solid buggy with alot of upgrade options available to make it very competitive... I Love my Hyper 7 takes a licking and still keeps going... you can find good deals on them used too as low as 1-200 buck for everything and extras...

if you are going used though I would also check out the mugen, Losi 8ight 1.0, or one of the other brands, new Definately go for the Hyper 7.