[Unobtanium-inc]

The 996 Turbo will be collectible, if it is a nice example. The problem in general with the 996 is they made thousands upon thousands of them and we are entering into a phase where they will start dropping like flies because they aren't worth fixing something big, much like the 928 has been in for the last 15 or so years.
Another good comparison is the mid 70's 911's that are just now coming back, after being in the douldrums for decades.
So if you are going to buy a 996 or a 996 Turbo for future collectability buy the nicest one you can find, meaning in today's market plan to spend $50,000+ on a Turbo, buying the $32,000 one with 150,000 miles and wheels made by some Italian company you've never heard of is not going to be the collectible one.
And if you plan to buy a 996 for future growth, find a low miles Annv. edition.

I own neither, everyone I drive is air-cooled, but I did drive a 996 when I was looking for another car. It drove a little too refined, like a Japanese Sports car. A friend who works for Porsche once confided in me that the 996 was a car the accountants designed, I felt that when I was driving it, nothing raw, nothing scary, like playing a video game where you see the gauges move, but not much else. It reminded me of driving a Mitsubishi 3000.

---Adam