I don't think you really can go wrong with any of the race level buggies out there right now. A lot of it comes down to your driving style.
I personally run the Academy GV2 Pro buggy, and I have been quite happy with it. It comes with some nice hopups standard that are options on other vehicles. I have always been a big fan of the Associated B4 as I could always get it to work wherever I ran, but I am seeing better durability with the GV2 Pro as well as it fits my driving style better. Some nice aftermarket parts are available for it too from diggity designs as well, and it can use AE style wheels or the 12mm hex wheels it comes with standard for the rear, which are nice are the whole pin setup on wheels I am not a fan of.
If you want something alittle different, the Academy GV2 Pro is a nice option.