I wouldn't go from an FN2 to a 200 and equally I wouldn't go from a 200 to an FN2, too similar to warrant the hassle and risk of a used car purchase, unless it's a ****ter you have now.
I actually looked at buying an FN2 a couple of weeks ago when I had a scare that my 2nd steering rack had failed. Thought enough is enough and I'll just buy the same but from Honda basically, thinking to improve the build and general reliability. But given I would want at least a 10 plate to get the diff and similar age with low miles to the Clio, we're talking 12k+ to buy. Luckily the rack was fine so confidence in the Clio was restored. It also seems synchros are just as much a week point on FN2's as they are with our Clios.
I think as standard you'll find that despite how good the chassis is on the 200 (and it really is when you are on it), you'll find though the pace lacking in a straight line. And it is not easy to tune like an FN2. I mean fit an RRC, exh manifold, Tegiwa induction, cams, Flash pro, FD2 oil pump setup and you'll run 260bhp in an FN2.
Don't get me wrong the 200 is a cracking car and I it think looks nicer, but imo swapping a pretty focussed NA fwd hatch for another of the same ilk seems a pointless.