I personaly like camaros more then anything else, but quit honestly we need less of the same. I would think a Mustang would be a good chioce just to give variety. I wouldnt mind seeing what else is out there. Now for my car, I have a 1973 camaro which I think is great. I chose this car because of the front head lights and rear tail lights.

Pick what you think looks the best and what you would be proud of.

I'm a chevy guy but would have to go with the Mustang too because that year is MEAN looking. But the Pontiac guys and 2nd gen Camaro guys got me thinking and a 70-73 Firebird would be very cool. Not overdone in the least, not a Camaro, Poncho 455 weighs the same as small block chev, aggressive looking, readily available, and You could follow PHR's project G/28 to get a ton of proven, readily available bolt ons to make the thing rock!
Remember Poncherello's T/A on ChiPs? Imagine that car hammered down on some 19" Kinesis cross laces with gold anodized centers! My next stop might just be www.traderonline.com !

I agree a second gen Firebird would be a nice change of pace for Pro-touring.

A-Bodies (Chevelle or GTO) offer the best bang for the buck. Lots of easy to install part available, plenty of room for big rubber and if you are on a budget, you can start with a Cutlass or Skylark. The right 442 or GS trim will go a long way towards dressing those cars up.

Of your three choices, I personally would do the 69 Mustang. I'm dying to build one in semi-gloss black or silver with the outer headlight buckets in red and shark's teeth on the leading edge of the front bumpers--bomber art style.

I can't get that picture of me to load. Which embarrasing photo was it?