It's an interesting debate! My words of wisdom may be a bit different from others. Now, these are just my views and may be at odds with others but I know I am right [
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The first thing is that, IMO, don't get a C2 and modify it unless you are happy to effectively throw the money away. I have seen some wonderful cars built but they are rarely worth more than a standard car and sometimes less. However, done sensibly, you can end up with a car that is a good comprimise between a C2 and an RS.
The next issue is the whole business of the ride quality of an RS on UK roads. Let's get one thing straight. It is firm! It is probably too firm for all but a handful of enthusists who want something very specific from their cars. But make no mistake. It is a total myth that it is too firm. I can name modern cars which are as firm or even worse that don't have the same stigma.Is it too firm for UK "B" roads? For many, yes, but I cannot agree.
For many, the RS is not an everyday car but as a weekend toy, for people who are looking for a certain something, there is nothing that beats it. Effectively, you are buying a road legal road car. The noises and sensations are those of a track car. If you want to go for a nice spirited drive in the country with your wife, get the C2. If you want to make sure she doesn't want to come with, get the RS (now where is the tongue in cheek smiley!).
Once you reach the track, the cars are chalk and cheese. Only an RS will do!
So, you need to decide what you really want and the best way is to try both. Then you will know which you want.