Wheels wise, stick with the OZ F1s and see if you can source some Renault centre caps. However, they're becoming as rare as hen's teeth so here's another option
http://www.cliosport.net/threads/make-your-own-oz-f1-centre-caps.714721/page-3 if you wish to avoid expense and maintain an OEM look.
Rust wise, check around the fuel filler cap
http://www.cliosport.net/threads/fixing-rust-in-the-petrol-filler.804991/#post-11334521, around the rear wheel arches, and around the jacking areas on the sills which are susceptible to damage. If it's merely surface rust, you can rub down, treat, prime, re-paint and underseal.