Biggest classes at the moment are still 10th Off-Road, and quite possibly touring cars (but who doesnt like bumps and jumps and some dirt??)
Your Cat 2000 is possibly still fairly competitive at club level, but may be hard to find spares for. Currently in 2wd off-road the Associated RC10B4 is clubmans favourite, but 4wd is a mixed bunch (New RC10B44 (4wd AE) and the Hotbodies D4 would be cars that are going well of late).
The biggest upgrade you will need is electrics (batteries speedos and motors). Your brushed speedo may be okay, but any motors with todays batteries will probably not last, which comes onto brushless motors and speedo's (which are nearly maintenance free, and performance does not degrade like brushed!).
HTH
Mark
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