Lots of good info here but I'll +1 on the Pilot Super Sports.
For Winter you better have spare tires though since I cannot vouch for any Summer tire in the cold.
My WRX and Z4 both run em and the grip in all weather conditions is very good. The Z4 is extremely well planted with PSS tires and feels akin to a gokart when I stiffin up the suspension.
In the rain I drive normally and haven't ever felt like the car was hydroplaning.
As long as you keep it safe these tires are fine in the rain.
I just wouldn't reccomend doing too many overboost launches.
For street usage the PSS tires are overkill.
For emergencies I bought a cheap can of slime off amazon for under $20 and I store it in the ski pass through which it fits inside quite snugly.
Cons:
Unless you granny your car don't expect to get much more then 15,000 miles on your tires. I do mostly highway but I defiantly abuse them whenever I can and the tire wear shows.
My old thread on tires and wheels:
http://e89.zpost.com/forums/showthread.php?t=1010218