[Stentor]

If you've got an extra $50k to spend on a Cobra (~$150k in total for an aluminum Shelby) and it's important to you to have an aluminum CSX 4000 Cobra, then the aluminum car makes sense (and yes, the aluminum cars are going to be worth more than the fiberglass, largely because they cost more).

If you want an aluminum Cobra, but don't need/want a Shelby CSX 4000, go with a Kirkham.

If you want a Shelby CSX 4000 Cobra but don't want to spend $150k, go with the fiberglass car.

The answer really ties back to what's most important to you and what you really want.