"As far as $600.00 for a back plastic retro-fit, I would go for the whole new top only a little more than $150.00 extra.
I was planning on a new top w/glass sometime this year myself and I too have the 2k box."
I have gotten two price quotes for the GAHH top with glass window installed, one was for 1550.00, the other was for 1850.00. The fabric on my top is in OK but not great shape, that is why I would consider the plastic window replacement (and save 1K). Also, the fellow at the shop said he replaces lots of plastic rear windows on Boxsters.
Ed