Gizmo, there are heaps of good competitive chassis around at present:


Schumacher Mi2 (new version due Christmas)
Corally RDX
Team Associated FT-TC4
X-Ray FK05
Losi JRX-S
Hot Bodies Cyclone
Yokomo BD
Tamiya 415
Tamiya Evo 5
HPI Pro 4 2005

and probably others I've forgotten. Any of these are competitive. Ultimately I think it's most important to pick a car you can get parts and support for and that you like. Check at local club and local shops and see what is supported.

if you specifically like shaft drive then the FT-TC4 would be well worth a look - good results from those that have this car (it has only arrived in the last few weeks).

You really can't go wrong with any of those cars - all are competitive and have those who love and swear by them. Some have better local support and parts support in some areas than others.