I'd stay away from the XTM stuff...it's cheesy stuff, but most of all parts aren't readily available at most hobby shops like other brands.
Around here, you can only get XTM parts from Hobby People or on the web under whatever name they're sold under other places around the world.
Another suggestion would be to buy a used high-end buggy. You'd probably end up spending less in the long run, since you'd probably get some spares and you wouldn't need to do as many hop-ups to make it survive.