I'd take the 182, My girlfriend has a Fiesta ST and i've got a 182, so i get to drive both - 182 for me, the ST is good, but just not as good as the clio. Early ST's are poorly equipt as standard(get a facelift) with the darker front lights. But even then you dont get half the stuff you do on a 182(xenons, cruise, climate, etc etc ) Clio is alot faster (unless you find a st185 montune spec one) and i find the handling and brakes better on the clio also.
Ignore the Ibiza, especially if you are looking at the Y reg ish shape as we had one of those a few years ago, what a load of rubbish - a good strong engine (20vt 150bhp) people will say i'm sure but it was soo dull to drive and the handling as standard is pretty bad. Poor interior quality and badly made... no we didnt have a bad one, it only had 35k and was about 4 years old lol
Both our 182 and Fiesta st runs rings around the cupra both on handling/fun/build.
The only thing i liked about the Cupra was the low down power where as both clio and fiesta you have to really rev them to get them going like you do with most modern 16v motors.