Supertouring Mike makes good points; he also quotes Bruce Anderson,
. The August issue of Excellence has a Marklet Update on '74 - '89 911's. The magazine is a great resource. You can also check out Sports Car Market for pricing guidlines. Finally, get a copy of Dean Batchelors book, Porsche Buyers Guide. I have the 1997 4th edition, there may be a newer one out by now. Read it cover to cover, several times. Start reading every thing you can. Cruise the Porsche forums to see the pros and cons of your target model. Understand compression leakdown, G50, chain tensioners, valve wear, and clutches. Find a reputable and trustworthy Porsche mechaninc. Have a detailed inspection done on any car you're considering. Ask the mechanic doing the inspection if he wants you coming to him with the car as a customer - good mechanincs have plenty of work, they are not interested in taking on problem cars.
Do not discount the non-911 variants. Some are very capable performers with great reliability; and they will take the sting out of the hit to your wallet compared to a 911.
If you have any specific questions, please post them here. If I dont know the answer, I have access to it.
At 15K you should be looking at an early/mid '80's SC in good condition with moderate (> 12,000 miles/year) mileage.
Mark - in search of the perfect black 964 with less than 75,000 miles...
