depending on what hey are parts aren't that easy to get hold of.. especially harrier stuff.

I'd say hold off and get a base model that's been worked on unless you're really bothered about having a harrier or RS (more for your ££). you may well end up cutting it up like i've done if you want it to handle, and if you get an RS it'll already have the anti tramp bars, and i'm reliably they're informed they're a total bitch to get rid of.