4x4 pede, capable but a bit slow and weak drive shafts. but both can be upgraded. but the model alone hits your max price range.
There is the redcat terromoto. haven't owned one yet but have read mostly good about it. it is 1/8 scale, but they are soon releasing a 1/10 scale version of the same chassis. Either version will be in your price range. With the 1/8 scale, you will be running 2 batteries at a time...something I have never liked. The 1/10 will be a single battery im sure.
A brushless wheely king would be neat. Cant go too crazy on power tho, without upgrading the axles and driveshafts. But a 35amp ezrun with a finned out 380 motor on 2s should be fine. you can get the truck and the BL system for $300. Leaves money for other upgrades.
you could buy a axial dingo kit, install a brushless system and big tires
I will have a kyosho mad force cruiser I am selling. 1/8 scale, but it is a solid axle truck. Sucker is huge and has tons of power! They go for $550 new. But I got mine used and it was in your price range. only downside is parts support in USA is weak. But then, the parts hold up well.