Optimum tyres?

[a6khu]

Hi guys, was just wondering from experience or knowledge, what are the best porche approved tyres to fit on a boxster s with standard 17" wheels? Currently running on Conti's..but tempted to go along the Pirelli way? (205/50-F,255/40-R)

Also get a rattling noise ,which seems to disappear whn the clutch is engaged,any ideas? is it time to replace? Thanks.