The stampede 4x4 is very reliable and there are a plethora of upgrades available. Spending the money on the vxl version would be best, but you can stay a bit cheaper and get the brushed version. It's geared lower in the diffs and has a plastic center shaft, but is a good starting point to later upgrade if you see fit. I would suggest you go with a 2S lipo in it though vs the NiMH packs it comes with. You get better run times and a more stable voltage which means speed won't drop off much from beginning to end of the pack. However, brushed just doesn't do as well as brushless.
I have a stampede 4x4 vxl and really enjoy it. I only run 2S in it, but that's enough for what I do at skate parks and whatnot. It's pretty good in stock form, but if you run it much, at least upgrading the outer axles with MIP X-Duty cvd's is your best first upgrade as well as alloy shock caps. Other than that, it will take a lot of abuse out of the box.