The thing you have to look at is what type of car can you get for $18k with 30k miles? And then you have to compare that to what you're getting with Jeff's coupe. If I had the money and was in the market, I'd get it. It will run forever, is extremely easy to work on, and obviously the aftermarket is there if you ever decide to mod it more.
Remember, this is a low 12's car as it sits with crappy 60's. In cooler weather with traction it will run solid 11's. That's value.