WOW thats a tall order for only $250.00. My guess would be Traxxas Bandit might be your best best.....never owned one so it's just a shot in the dark here.
RTR XL-5 brushed waterproof around $199.00 ..... http://traxxas.com/products/models/electric/2405bandit
RTR XVL3s brushless waterproof around $329.99 ..... http://traxxas.com/products/models/electric/2407banditVXL
Almost everything else that's a buggy is usually for a race application, yes they do have upgrades but are not built for a lot of strength as opposed to lightweight for speed/handling.