[Rollins]

The S2 would be a good car to get. You'll pay a little more to start out with though. The S2 is an NA as well, and therefore should be more reliable and less costly to maintain. However the parts are inevitably rarer and generally cost more. Depending what you want out of the car would really better determine which one is best for you. If you're looking for tons of power then go for the 951. If you're after the turbo look and don't care so much about power, then a S2 would be great. The 951 is real easy to get over 300 hp in, while the s2 is not. Anyway, as Andre said maintenece has a few key aspects. If the car has been well maintained, obviously it will hold up better. If you are at all mechanically inclined then that is a huge benefit. When you go with a mechanic a $500 can more than double. Anyway, good luck looking for a 944. There is no other car like it, and you will love it.
-Tim