If you are sticking with an 18RC with some basic improvements I don't see any advantage in stuffing about with a gearbox upgrade.
New bushes, springs and shocks will make it handle nice, and I would consider putting new whiteline or similar sway bars on it too.
17" rims will look crap. Classics shouldn't have any bigger than 15's on them... but that is a matter of personal opinion.
The steering on my RA23 is excellent - if your bushes are all good, your steering box is adjusted, I think you will find it steers more than well enough.
R&P upgrade is useful when you are upgrading motors and need to get rid of the steering box for clearance. Also probably an improvement on a serious track car. Other than that you are wasting your time in my opinion.
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