500 for a rtr is cheap these days.you might have to go used.My personal favorites are the mugen mbx6..would like the new ofna hyper9 2.0 or the kyosho mp9 tk2 but they are way expensive.Try ofnas ultra mbx comp I own one its around 330 and its great have had no problems with it and nothing but the stock servos have stripped.ofna makes great buggies and if you need extra parts you canget them on ebay cheap for as low as 1dollar..Other buggys you will have to pay lots for their parts..