Personally i think you would have more fun with a raceable street car (10 sec driver) because you can take it on the streets, you know its reliable, drive it anywhere, and still go to the track. On the other hand if you build a full blown race car, it wont be as much fun on the street, not as reliable, breaking stuff all the time etc. where as you can have a fast car you love to drive and leave it at that.
Not talking about anyones cars, this is how i would see it.