Smaxxin; try to pick up a cheap RC10T3. It's the older model, but still competetive. I have a feeling you'll like it. It has a ball diff, but it is put together with a little more thought (the losi design uses 6 cone-shaped washers for pressure on the balls, whereas the AE uses a spring). The design on the AE "Stealth" diff really hasn't changed all that much since the first edition in the original RC10T.
The RC10T3 is an extremely planted truck with the box-stock settings. Throw a set of edges and bowties on it, and the truck is setup for 99% of surfaces.