I have a 2005 convertible with 100K miles--so I'm starting to look for a new one. My biggest complaint about my current car is that the Rear Window Defroster quit on me just after the waranty was over (of course). My mechanic soldered the wire, but told me frankly it wouldn't last--and he was right. He said it was an inherent problem with the convertible and suggested I buy a new rear window (for $700 at the time), but there was no way to guess if that would last. So I've been scraping the back window (which the last two winters has been pretty frequent). Any advice?