Lazer ZX-5 upgrade help

[littlened]

Hi all,

I've got the RTR version of the ZX-5, so far this is what I've done.

4.5t brushless motor & ETC (it's not running anywhere near it's max because I can't handle it)
2.4Ghz radio gear
New wheels, tyres and foam inserts
I'm put some traxxax shocks on because the originals leaked
I've had to replace the plastic bars on the front of the car with alloy ones as the originals broke (suspension holders?)
A new shell? It's not the bullet style one and I can't even remember where I got it from

Anyway, obviously I know that many of the parts on the car probably won't last very long, so what I would like to do is plan to upgrade the car gradually, but I know some parts are very much dependent on other parts before they can be fitted.

Next on my list is to replace the plastic CV's? with metal ones (front and rear), and I'm just wondering what parts I need to completely fit these? Do I need new wishbones and driveshafts? Hubs? Wheels? Is this what I should be doing next, or is there another upgrade you would say would be more important?

I'd just like to know what to buy to complete the job, especially when some parts take 2 weeks to be delivered, I don't want to get the parts delivered and wait 2 weeks for me to realise I need another part.

Does anyway have a kind of upgrade path? i.e. what you'd replace first (and part numbers), so I could upgrade in stages?

and before anyone mentions, yes long term I might have been better off buying the FS kit rather than the RTR, but at least this way I get to work on the car bit by bit.