I'd recomend a rally car. I had my tc3 for a while, and ran a basic 5300/7018 setup, as well as a b50 8s/hacker sport setup. it was pretty fun, but after I got some SNR rims and tires on it, and stretched it to 200mm, it was a BLAST on loose gravel. i'd say do it, but you'll most likely need to beef up the drivetrain.
I had 200mm aluminum front cvd's, NTC3 rear spool, and 190mm titanium rear cvd's, as well as the 200mm onroad kit (that comes w/ the aluminum cvd's), and the SNR tires.