Oh damn, SmackdownHotel is right about that. The average American vehicle is probably the stinken mini van! I blame the average American consumer :|
But the top selling vehicle in the US for quite a few years running was the F-150. You can get one for about $20,000 with a few nice options. It's got good resale value, easy to fix, safe and sound. Well, in the winter they suck, but you can't have everything.
Stack up all the desirable vehicles you can get from Europe, Japan and USA at the $20,000 price point and see what floats to the top. $20K ain't much to work with, but should be enough to slap something usable together. The F-150 ain't bad...
The '69 Charger Daytona was designed as close as possible to be like the one raced at Daytona. I don't think it would take too many mods to get it up to that caliber, though it would be expensive. That wing was part and parcel of the real deal. Notice that a "functional" wing is mounted high and/or huge when the speed gets up there.
Hey, if you bought a 911 Turbo, you wouldn't likely be driving at sustained top speed either, though the functional wing and ground effects would still be there serving no useful purpose at normal traffic speed.