If it will be seasons before you will be able to use the potential, why not buy a 929 or 954 with low miles. They will undoubtably have better resale (less loss of $ than the 07 or 08).
I mentioned this before, but remember the 96 civic vs the 95 civic. The 95 looked much better at the time. The 96 had these strange super huge clear headlights. Now EVERY car has huge clear headlights and it looks way better than the old 95 opaque smaller headlights. That is the way you can tell an older car from a newer one now.
The same thing will happen with the 07 vs the 08. If you are ok with older style, you could get good looks with the 954. You could also use a few of the $$ you saved for some really cool add on's to make it look even cooler.