The GT2 is an awesome machine! For cheaper body options, you can always throw a Dragon Racing GT1 chassis on it, or for all out strength, do a Kyosho 777 Chassis conversion. Then you can run the non licensed bodies *PF8 etc*.
However, the Kyosho bodies are very strong, and reinforcing them with mesh and shoe goo will go a long ways.
You want to go with the Kyosho Shoe Type Transmission once the stock one finnally quits. Kyosho IGW008. It's a direct drop in on the GT2.
The DM-1 spec and GT1 share the same wheelbase, the GT2 and DM Pro share the same wheelbase. I would say GT2 or DM-1 Spec. I personally think the DM Pro is just too heavy! Plus the GT is a little easier to setup.
Hope that helps.