hi there!.... you wont be disappointed if you do get the pred!!!
spares i would buy are:
-2x spur gears (go for the x11 white gear)
-1x set of front and rear hubs
-1x gearbox top
-1x set of derlin steering posts
if you need part numbers let me know and ill fin them out, id say thats about it enough to get you going
any more questions, feel free to drop me a pm
Tom