I had this problem last month and in the end I opted for a 172. I think it all depends what you want from your car and what you intend to do with it? I couldnt justify the extra cost of buying a 182 for the extra 10bhp, different wheels(nicer wheels imo) and two tail pipes, especially as I knew I'd be changing the wheels and exhaust anyway, plus I like the fact its a very subtle little car.
I think a 182 with the cup suspension and wheels looks awesome and doesnt need changing(except the front seats), so if you want a nice clio and dont wana mess with it, get the nicest, cleanest, newest 182 you can afford and just enjoy it.
If you wana modify and change stuff, I'd say get a 172 and make it the car you want.