any-one who says a 197 slow is used to sub 6 second 0-60s imo, between the 197 and my friends 172 I noticed virtually no difference in straight line speed, its been said before but its all down to who hits the loud pedal 1st. Just out of interest, you listed a cup and the R27 have you not considered FF197 with cup pack?
I sat in a cup and to be honest the difference in weight wasn't worth the lesser interior imho. If you are unsure of the older model clio's as its similar to your current clio then go for the new model defo. That is the reason I went for my 197 over a 182, well that and I wanted to be the 1st owner of the car for a change lol.
Best thing to do is dead simple. Test drive a 1*2 and a 197 and decide which you prefer. If you decide 197 test a cup and a 197FF to feel the differences. Chassis wise, the cup is the same as the R27 however the Recaro's are superb.