I think that you have them listed in the right order for purchase.
The stock shocks on the T-Maxx just plain suck. Plastic bodies and weak springs make them prime targets for destruction during any hardcore bash session. The slide shafts on the new T-Maxx are a little beefier than they used to be, so you may not need to rush right out and replace them...BUT you will one day want to. I'd start at the four corners and then get the centers, but that is just me. Just remember as you make more and more of the drivetrain rock solid, you will need to upgrade other parts and work your slipper clutch well so as not to fry the tranny or any diffs. The other parts in question would be the internal gears of the diffs and the tranny.
For now...go with the upgraded shocks.