Welcome!
Incredible picture you have there - wish I had roads like that near me! The Mk5 must be a real step up from the Clio - I had a mk2 version (a meaty 1.2 Oasis special edition...). Pretty much all the electrics didn't work, or did only when they liked. I did have great fun keeping the momentum up on A roads - the chassis was fun. A Williams or 16v must be a crazy little car!
The mk5 looks great - this site will help you spends lots of money...!