I don't think it'll make that much difference given that you're looking at a car about 5 years old. My wife had a Type S and it was a good car: plenty of performance from a 2.0 litre engine in a car designed for a 1.4 or 1.6, and particularly good legroom in the back. The only downside I can remember was that because it had fatter tyres than the basic model, the turning circle was very poor.

Re your other thread - the audio system was perfectly OK: I can't remember anything particularly good or bad about it.

As always, buying one from a dealer will cost you more but you have more protection under the Sale of Goods Act than if you buy privately.