Depending on how big your track is I would go for the 1700 or 1900KV motors, I have the 1900 powered by a RX8 and it's plenty quick enough.
Not sure about your servo choice, I think it will not be quite strong enough, 200 oz or 14KG should be enough torque though. I have a 1256 but had issues with this causing my Spektrum receiver to brown out. The 1256 and 1258 are the same just geared different. So if you run Spektrum I would look at a Futaba or something else.
I thought that the Durango could take four tenth scale saddle packs due the Velcro battery straps, it just means more cabling to join them all together. I use normal tenth scale stick packs and then keep them in pairs, charge them as one 4S pack etc. Many people use the Gens Ace packs if you do change to using normal stick packs which seem to be good, you can get these from Giant Shark if they have any stock.
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