http://www.tcscrawlers.com/Introduct...k-p-17756.html ($20)
http://www.tcscrawlers.com/HPI-HD-DR...4-p-17468.html ($11)
http://cgi.ebay.com/HPI-Savage-FLUX-...item5ade9efc73 (~$20)
http://www.tcscrawlers.com/HPI-Batte...8-p-17449.html ($15)
http://www.tcscrawlers.com/HPI-Motor...6-p-17446.html ($11)
http://www.tcscrawlers.com/HPI-Motor...7-p-17448.html ($12)
http://www.tcscrawlers.com/HPI-Batte...9-p-17623.html ($6 for the battery box mounts and the ESC mount).
http://cgi.ebay.com/HPI-Savage-FLUX-...shop/desertboy ($54 for the GCM modified clamp)
Think thats everything.... about 149. I don't think Mike sells any of these parts otherwise I'd reference his links.
Definetly recommend the bulletproof ring gear and pinion for both diffs. You can just swap out the Savage X ring/pinion;
http://www.tcscrawlers.com/HPI-Racin...2-p-17874.html ($25 x2). But under 4S you might be able to get away with the standard Savage X, if properly shimmed, for awhile at very least.
You could go with
http://www.horizonhobby.com/Products...odID=HPI102534. Horizon has it for 179. But you would still need a Savage single speed tranny it seems. Also the "composite" bulks aren't really necessary, better to get the bulletproof diffs which I can't tell if the kit has.