I may be able to help you...
A month ago i sold my 2002 Octy vRS, having owned it since the previous April, and doing 10,000 miles in it, including a trip to the nurburgring.
To replace it i just bought a 2003 Mk2 172 Cup, and i found one with Climate Control. I paid £7800 (from a dealer) and it had 21.5K on the clock. We are at the 'ring in May, and i cannot wait.
The Skoda was the better all-round car. More comfortable, higher level of equipment, better build quality. But the Cup is more fun, and the better performance car.
Steering: The Skoda would understeer, controllably, but once it started and power was applied it would just get worse. Very frustrating. The Cup will grip, more than you will believe, and you can feed power in and decide the amount of spin, but it will still hold its' line while scrabbling for grip. This is its best point, i think; its steering and the way you can feed power in without understeer. The Skoda did have good steering, plenty of feel, but not the incredible amounts the Cup has. The Skoda is a heavy car, 1325 kilos against 1021 (!) for the Cup. You could feel it, and once it started to understeer you could feel it a lot more as it lurched onwards towards the edge of the road.
Ride: The Renault is harder, stiffer, but not uncomfortable. Its rides very well, and the hard ride is not a problem. It doesn't roll much, which i love; once you throw it into a corner (large roundabouts are almost as good as sex now) it tips a little then corners almost flat, and you can get on with it. The Skoda rolled far too much, and then the weight pushed you straight on. It was frustrating; the Skoda has a great chassis but needed to lose some weight to take advantage of it. it needed a suspension kit to press on, the Cup doesn't.
Power: The Cup is quicker off the mark, and feels it, though as someone said the in-gear times are good on the Skoda due to the turbo and after 60 there would be nothing in it. But the delivery in the Renault is light years ahead. You can drive around and in any gear it pulls from tickover. In the Skoda you need to wait for the turbo to come in; without the blower its gutless. try a low-speed mini-roundabout in the Skoda in second gear; you come out of it at tickover and then nothing happens. I will always take a normally-aspirated car over a turbo for ease of power application.
Am i happy? Christ yes, though i would make the point that i no longer need a car for day-to-day use and the Skoda was bought for this, and it never let me down or did anything other than what it was meant to do. As an all-rounder it was fantastic. Then i bought a van and wanted a car to have some fun in. So i don't run the Cup as a day-to-day car. I can't see it would be a problem though.
Go for it, would be my advice. You won't regret it if you get a nice Cup, especially one with Climate (which the Skoda has, and i couldn't live without, hence me searching for a Cup with it). But i wouldn't go for an older one; spend the money, get a nice one and travel if you need to.
My friend was looking for Integra Type R's and we looked at 2. Then i let him drive my Cup. We looked at one for him 5 days later and he picks it up this weekend. Another one with CC, late 2003, 7600 miles (yes, really). £8200. Top money, but its almost new!
I may edit this to add more as i think about it.
Andy