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As for pricing. It will always be more valuable than a 930 and less than a Turbo 3.6. A 996TT has more performance and is safer than anything before it, but is struggling to find buyers because it isn't the best looker. That counts for a lot in an emotional buy.
Your car looks better than the other 3.3T [personally I prefer neutral interiors], but if that car has real speedlines and new tyres you're talking $7,000 more value. Are those real RUFs on your car? If so, they would have a ready market if you wanted to swap them out.
All that taken into account, if it gets a clean PPI then $75,000 isn't bad, but $71,000 ~72,000 is a good buy. You could always try a low ball offer, but I'm betting an owner for 12 years is not depserate and you risk just annoying them. Good luck and feel free to ask any more questions.