I had a Slash for about 2 weeks before I sold it. I really liked it but I just needed 4wd. I don't race, I simply bash in loose dirt and 4wd is just the thing. Well if you are like me take a look at the e-slayer build I did:
It was by far the easiest things I've done and all those cooking 5700KV motors, the e-slayer is the perfect car for it. I'm running a ballistic 5.5T, 7400kv, motor and it runs cool, goes 32 mph, and runs for over 20 mins on 2s 4000mah lipo.
I think Traxxas should come out with a 4wd Slash but converting a Slayer is so easy that it's really not needed. And you'll see in my cost break down that it's not nearly as expensive as you might think. Enjoy!