I do loads of miles in my company car and take a close (some would say sad) interest in tyre performance.
I am not massively into "this tyre or that gives better grip" type arguments as I don't drive on the limit very often. What I tend to go by is price vs the mileage before they wear out.
So, on that basis, I changed the Bridgestones on my wife's Jazz for four Dunlop SP Sport 01. If someone else is paying, Michelin tend to give long service but I also liked the Goodyear Elegance I had on a previous car (Audi A6).
I buy from blackcircles.com these days.
Hope that helps.