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I'm with Britwrench on the longevity issue. I put about 50,000 miles of HARD use on a regular 951 clutch and it looked fine when I replaced it. It would be good to know why you're having such a high failure rate, but if you go with the Cup clutch chances are you'll be fine from here on in.
The Cup clutch disc will work with a regular PP, but I don't know if the Cup PP is different, has a higher clamping force, etc. Assuming your PP is OK, I would try to get it and the flywheel machined first to properly bed in the new disc.
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Jeff
78 911SC, Silver/Black, H4's, Recaros, 964 Cams, Custom Exhaust, 16" 930 Fuchs. Lowered & Loud 
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