My favorite topic…Porsche. The first thing is slow down and be patient, research and learn. Nothing is more frustrating than buying your dream Porsche and later realizing you didn’t know what you were buying. There many good examples available and there are some horrible nightmares (but look fantastic) just waiting for the uninformed Porsche shopper. Any Porsche if not maintained properly can be a money pit. Service and Maintenance records are the essential. Each model (and even year of each model) has it idiosyncrasies when it comes to strengths and weaknesses. Porsches are very rewarding and very fun to drive (all the models) but getting a poor example can really sour you experience.
Realize that Porsches are a little bit different than your average car. Accidents and/or any type of paint work really hurts the cars desirability and resale value among Porschephiles. If a car has suffered damaged and/or had a respray of any portion, alarms should go off in your head. The price should be low as it will difficult to sell later. Personally I would not purchase a Porsche that has had paintwork done, (but that is your decision). If you do decide to consider them, negotiate the heck on it and get if for song. If you do purchase a car that has been repainted and/or been involved in an accident have it checked out thoroughly to determine how it was put back together. The wisdom “If it seems the deal is to good, then it probably is� definitely applies to these cars. Sure there are bargains to be found from those have come on financial hardship, but be very cautious. Prepurchase inspections are a must for any Porsche. You should get it done by a knowledgeable Porsche mechanic that knows the particular model and vintage you are looking at. Spending a few hundred dollars can save you thousands in repair cost. I usually recommend a compression, leak down test to determine the condition of the engine internally.
The two cars you are looking at could not really be that much different in what they offer. The SC is still a raw 911 with a torsen bar suspension and basically a useless climate control system. However, it is very fun to drive (and can be a challenge), there are some fun modifications that can be done, they are relatively easy to work on and it has the very distinctive air cooled flat 6 sound (which is awesome btw). You didn’t say whether the 911 was a coupe, targa or cab, which makes a difference in price. The 968 is much more modern with a decent climate control system, ABS, airbags, modern electronics, etc., and it has a water cooled 4 cylinder. The parts are very expensive for the 968 and they can be somewhat more complicated to work on as it has a lot more electronics than the SC. The 968 is faster in the straight line in stock form than the SC, and fun to drive with a near 50/50 weight distribution, but not as challenging or engaging as the SC.
I agree with the others. Check out Rennlist. NADA, Kelly Blue Book and Edmunds are sort of worthless when it comes to determining prices. You can get a much better feel for the market by discussing this with the people on Rennlist. Also you can contact your local PCA (Porsche Club of America) chapter for suggestions on mechanics and advice. I am the president of my local PCA and can get you the email of your region people, or you can look at
www.pca.org. The last advice I can give you is drive many examples of the cars you are looking at to get feel for how they drive. Most importantly have fun.