[Perfectlap]

Skip the performance upgrades. Costly and very little gain.
Install the IMS Guardian for your dash. And try to find out who did the clutch maybe they were wise enough to replace the IMS bearing. If they didn't find another independent Porsche specialist. I would take the car in for a full diagnostic to check out the cooling system. It would be good insurance to replace the water pump if the car is still on the original and mileage is over 60k. Replace all the caps, coolant, oil and fuel.
Take a sample of your oil and send it in to Blackstone Labs (since you have no records).
Start putting some cash into a maintenance and repair fund.

As far as wax. Give it a once over with a clay bar, I usually do this while washing the car. Follow up with a paint polish to strip away any
thing the clay bar didn't pick up, it also has mild abrasives to round out the edges on swirls. Follow up with a sealant to fill the swirl channels and protect the paint. Wait six hours for it to cure and top with either natural carnauba wax like S100 for a wet shine(but only lasts a couple of weks) or try a synthetic liquid wax that will last over a month. I clay bar and seal with each season. I like the Griots Garage product line because its available in store at Advanced Auto. Their green and blue tiwels have a long nap weave which is the least likely to marr the paint. But if you order online try autogeek.net and get 1Z for leather, it's the best of I've tried.