Depends whether you fancy ready to run or kit? The associated b44 models are great kits and you can pick 2nd hand up for £120 upwards for rolling chassis. You'll need electrics.
You can alternatively look at things like FTX vantage or Tamco Raid which are ready to go straight from box. They can be upgraded with brushless motors, better batteries etc. these start from £100 upwards new and ready to go.
That said, there are plenty out there and everyone has favourites. I had a Tamco raid which was brilliant as well as a b44.1 which is also brilliant.
LTR, team C etc all do well priced 4wd rtr buggies