What is your favorite upgrade for crt.5

Well i was wondering what is the single best upgrade you guys can think of.

As i have some extra cash laying around to do something to my crt.5.

I do have rc8 front shocks coming in for the rear of the car.

What else do you guys suggest.

I was thinking of the titanium turnbuckles or something.
Or the cnc knuckles or rear uprights.

I keep breaking the factory plastic shock caps where the mount is.

And rear lower arms. Dont think i am ready for the aluiminum conversion just yet.