[s-cars] 245/40-17 or 255/40-17 - which should I buy?

[Paul Dooley]

S-Heads,

It's time for new skins for my car and I'm debating which size to buy.  
The patient is a 95 S6 with 2-Bennett coilovers and Koni adjustable 
shocks all around with 2-Bennett front camber plates (2nd generation).  
The wheels are 17x8.5 ET 38.  I'm confident the 245/40 will fit and 
clear without any troubles, but can the extra 10mm width that comes with 
the 255 fit without rubbing?  What does the list think?  Will it only 
rub at full lock?  What about with 4 passengers? (but that is a rare 
day)  The car is not tracked - yet, but these will be my summer only 
street tires.  

Just need some wisdom from other's experiences with the different sizes 
and what I can expect.

TIA,

Paul Dooley
95 S6 - still running my snows.