[TARTMAN]

I have had my (used) sx3 for around 8 months. not adjusted the belts or replaced them once yet, or the diffs, only broken a few normal things like wishbones and shock towers. driven most weeks and has performed perfectly.
any saddles fit. I run a 22 as well........

I say go for a used sx3, can be bought around £140/£160. Needs no upgrades to race it, plenty of optional ones when funds allow.
spares to keep in the box, well........... set of wishbones and shock towers. thats about it for main stuff......

Spares are available from schumacher next day or countless model shops.

easy to set up and easy to drive........

I have tried a couple of others but sticking with the sx3, its awsome. in my opinion.............................