I've used P6000 and ES100. Infact I am using ES100 these days and this is my second set.
ES100 is good to grip and corner but a bit (bit) noisy and rather stiff. In my experience they tend to lose grip in cold weather but its over now, isn't it? They are very good in summer and fine in rain, excellent at high speed. Tyre life is normal, not short, not 50K either.
You can expect somewhere between RS 7500-8000 per unit and it really worths it. I'd recommend 205/60 for your car. Thats what I'm using and frankly I don't see a reason to buy ES100 in 195 or lesser.
Now, P6000 - first of all it a wonderful, wonderful, tyre. Very good with the grip and wet business and smoother than ES100 in my experience but it doesn't work on our roads. Every thing said about P6000 above is almost true. Yes they tend to get hard, tend to make noise, tend to lose traction and deform tread but thats all because of our super slippery, big-time bumpy roads. Its a European tyre for European cars on European roads and it works better than anything there.
I'd say don't go for P6000, its too much of a tyre for our roads and weather. And thats the bottom line, really.