I am thinking along the same lines, but with an OFNA GTP. They are bringing out a roller aimed at the oval dirt crowd. Basically an ULTRA buggy with shorter shocks and a solid ctr spur. Cheap too, under 200 IIRC.
Link:
http://www.ofna.com/ugtp.php small box in the center of the left side of page shows the roller.
Figured a 9xl or 1800 kv motor on 5s, geared for around 40 would be nice. Or go HV (8s+) and gear it too the moon for speed runs. It would look impressive doing 70, dontcha think?!?!?!?!?