Granted, by replacing the clutch you will have to add the extra money for the clutch kit, but not replacing it would be silly!
Here is why, if you don't do it and it goes out in a few K miles, then you have to do the whole nine yards all over again and you'd kick yourself in the rear.
This is also a good opportunity to think "upgrade" to a performance or street/race clutch.
Yes I know, it will add somewhere from $500 all the way to $1300 to your tab, but it is worth every dime.
Check out those links I found for you.
http://www.vividracing.com/catalog/sachs-high-power-clutch-disc-porsche-boxster-cayman-p-53196.html
http://jdmultimate.com/i-332849.aspx
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Porsche, is driving in its purest state. It's about handling agility and throttle response so in tune with your instincts that the car no longer seems to be merely a machine, but an extension of yourself.