Go with a 3000kv or lower with a 120amp setup personally I'd look at hobbywing combo c4 2000kv motor sc8-wpit's a great setup and you could run most gearing setups with it and will give you oodles of tork and can handle upto 4s (motor can take 6s with the 150amp esc but that's extreme power nore is it waterproof like the sc8) I've run the 3400kv sc8wp setup in a slash 4x4 similar weight to your truck and it's struggles when gearing up for speed and can't take 4s if you decide to upgrade batteries in the future for more power the 4700kv is better for 2wheel drive and/or smaller lipo packs 2s max really and you will have to keep an eye on tempretures all around..
For ease, reliability and peace of mind setup with power that will outrun most nitro setups in a straight line get your self a mamba monster 2 or mamba sidewinder 8th edition with either the 2200 or 2650kv motors but if you don't wanna spend that much the hobbywing 2000kv setup is a great system