I have also been looking for a hardtop cover. I did some searching last night, and decided that I can live without the Porsche logo, and I am probably going to buy the generic hardtop cover from automotion. It serves it's purpose for $60 less than the Porsche one.
For storage, I was lucky enough to convince the previous owner of my top to give me the stand for free. But if you don't mind some work, and not mounting it on the wall, look here:
http://www.stormaster.com/Hardtop/