The Tibors on the clio are silver and 17" so you should be able to tell the difference.
I've had both 19 steevs and 18 AXL (track set) on mine and the 18s are comfier in comparison. I personally like the machined steevs look so have kept those on.
The variants are mighty confusing and theres still discussions about it all the time. Generally speaking:
Cup = 18 wheels, leather seats, halogen lights
Trophy = 19 wheels, Recaros, bi-xenon headlights (these are a good consideration as well)
There are variations inbetween due to factory options, plus models etc but that'll give you a general idea. Dont get the "Sport" model because no LSD
My suggestion would be to look for a Trophy model to get the nice upgraded bits and buy/swap for a set of 18s, they come up from time to time for sale.
Good luck in your search!