To answer your question, NO i have never been in a situation where it was either mod my car, or buy a GT500, but thanks for reminding me.
on a serious note, your car looks great. Be warned though Mods are an itch, that just cannot be scratched. Once you start, it never stops. I'm not really a fan of Red Mustangs, but with the stripes and the blacked out grill, i actually really like it. Good luck with whichever you decide!