So I'm thinking of getting into a cayman this year. Seems like a great car and sometime in the future I'd like to build the engine and turbo.

I've been watching cayman prices for a few months and it seems like resale prices are dropping quite rapidly.

Obviously the first thing I'd like to do is get an LSD in the mix.

What's a good year? I'd like to go with either a pdk or 6speed. I've heard the 5spd are harder to get LSDs for.

Is there a downside to going with a 2006 cayman S?
What's a good price for one?
The book value for a private party is 30k, but I've noticed nothing on craigslist or ebay seems to actually sell for that much. Can one be had for 25k or less?