If I were to buy an RTR basher ST right this second, I'd buy an EVST. great engine, not-completely-crappy radio, and it's fairly tough.
it is NOT as tough as the GT (aside from the Traxxas Rustler, no truck is), but it's quicker and handles better in stock form.
However, for your purposes (and the purposes of many others) the GT is simply a superior truck.
best advice i can give you is
READ THE MANUAL
I've met a whoooooooole lotta people that have fried diffs and engines because they didn't do something that the manual told them. they tell me "this truck is a piece of crap, why'd it break"
BECAUSE, you didn't READ THE MANUAL.
have fun with your new rig