Flywheel Replacement???

[986Porsche986]

I will be changing the clutch on my 2002 S with 60,000 miles next weekend. Its not slipping but it is getting very stiff to push down. I have changed several clutches on other cars before, and usually have had the flywheel resurfaced. My question is, nowing that I cannot resurface the flywheel, what are some signs that it needs to be replaced, besides the obvious signs of cracks, uneven ware, burned marks, etc.. Should I save the $600.00 or just replace it anyway because I will already be there with the access to it. What is the average life of a stock flywheel?

Mark