Well, if the Revo suspension is all you want, then you do have more choices for chassis style.
Another advantage to the stock chassis is that you can use the stock tranny with a nice slipper setup. The tranny internals needs modifications to be able to use motor brake and reverse, but seems to be pretty sturdy. And there is a center diff option for it. :)
Reading thoroughtly you comments it seems that it is not difficult to modify the stock Revo chassis to admit an E-Maxx tranny (I already got one)... can you please let me know where I can find info of how to do it???
What about the center driveshats and drivecups? is there any mod needed here?