Ok, I know the basics on the 2 engines. Mach 1 has a DOHC 32v 4.6L (305 advertised hp) while the new GT's sport a SOHC 24v 4.6L (300hp). I've read in a couple Mustang brochures that they substantially strengthened the new frames (05+) and I guess shaved weight by doing things like an aluminum hood? Intrinsic and style differences aside, which is the better all-around car? Are there as many aftermarket parts for the Mach 1's as there seem to be on the new models? Is it as easy to add more hp to the Mach's as all these bolt-ons do for the GT? I want any info thats prudent! What have other Mach 1 owners been doing to their rides? etc My budget is constrained, a Mach 1 says perfect....but a new GT (I can't find a decently priced used one) says owie! Am I going to kick myself if I buy a Mach now rather than waiting for used GT prices to come down?