I too have also heard only good things about the Michelin Pilot Sport PS2.
They are a seriously good tyre. I'm just amazed on how many peeps seem to ignore the fact that Porsche factory fit them - if there were a better tyre than the PS2, then Porsche would fit them. The PS2s are also standard fitment on many of those crazy 'Renault Sport Renault Megane Sport . . . whatever they are called' hot hatches. F0rd a also fit them as standard on their ST and RS models, and Merc also fit them (though Merc don't seem to have any consistency).
PS2 FTW any day!

whilst I'm not denying how good a tyre they are, the cars you've quoted run special compounds of the Pilot Sport do they not?
and designed specifically for that particular model?
OK, the Porsche GT3 uses the semi-slick
Pilot Sport Cup tyres, but ALL other Porsches use the bog standard PS2s which you can get from your local ATS or ThikFit. On BMWs, only the lightweight M3 CSL had the Cups, all their other cars, including the 'standard' M3/M5/M6 all use the standard PS2. F0rds, Audis, Mercs again all use the standard PS2.
Regarding the Reno, I
think the Megane with the standard roll cage (and lurid paint scheme) use the semi-slick Cups, but the more normal Sport Megane (225 I think), along with most other cars in the Reno range use the standard PS2s.
I suppose the only real odd-ball is the Veyron - it uses the standard PS2, but also uses the Michelin PAX system insert.
Also another stumbling block is the sheer price of the damn things 
I don't deny that Michelins are always more expensive than other 'similar' quality tyres, but if you do some research like using all the internet sites, and then fone around a dozen of your local tyre specialists, you can invariably get the price much lower. When I last got a pair of 235 PS2s for the GTI, the highest price was £260 for one, but I eventually got them down to (I think) £140 each - all in. Don't forget that as well as Michelins generally gripping better than others, they are also generally quieter, more comfortable, and last longer too.