I would suggest looking at adding the Durango 14mm hex drives and then use the latest revision wheels. Do it before you get too many wheels and tyres mounted up. It's definately worth while.
You'll need two pairs of these:-
http://www.rccarshop.co.uk/index.php...14mm-2pcs.html
Some rear drive pins for the front:-
http://www.rccarshop.co.uk/index.php...-4mm-2pcs.html
And then obviously the new style wheels:-
Front
http://www.rccarshop.co.uk/index.php...hite-2pcs.html
Rear
http://www.rccarshop.co.uk/index.php...hite-2pcs.html