There is a full spread on the Durango homepage about the changes.
http://www.team-durango.com/race-cars/dex410v3/
Think the *best* of the changes are to big bore shocks and the HD ball ends. (which are far better than the stock ones)
The ball ends you can get for a few quid. The big bores are about £110-120 a set. Almost worth buying the car just for that! Other than that, it seems to be convenience (rear hanger) and tweaks (plastic side pods, nitrided shafts, driveshafts, carbon towers)