Whoa!!!
The Ford GT (you guys, ie England wouldnt let them use the trademarked "GT40" name

) will be basically exactly like the cover of Car and Driver said....."The Return of the Ferrari Slayer" It should be on par with the Saleen S7. No disrespect, but its way past a Z06. Of course thats reflected in the 125k+ price tag.
Should be a pretty good match up in the forseeable future.
Z06 will get some more oats, but still wont beat the Viper. Getting Close though
Chryslers Sport Coupe's sound interesting, and should match up well with the GTO.
Lightning will have to contend with the V10 Ram (should be interesting), and the SS Silvarado is trying to enter the fray, but should stay on the porch a year or two more. Its kinda outgunned in everyway, shape and form.
The Cobra if it is true will be more than a straight line match with the Z06, but still not in the same league of handling, braking so it will still get smoked once the turns start.
The MACH 1 has no direct competition, its the GT Ford never built. 32V quad cammer (straight out of the 99, 01 Cobra) with a live axle. Nothing really special about the car, would have been a good match up with a 2004 Z or Firebird.
yeah,

I like to speculate
Rob