Savage 4.6 RTR over anything from Traxxas any day.

The Losi XXL is the best IMO. Check out www.overdriverc.com for good prices.. He was selling them at one point for under $600.. It's more than your budget, but it really is worth it. Spektrum radio, good LRP Spec 3-twin engine, bit, tough, very, very fast, great handling, etc..

The Savage X sounds about like what you're looking for though. The Losi XXL is just a more advanced, more complete package..