Best Show Mustang

The more Car shows i go to the more i want a a show car but being that i jus a bought an import project car i don't really have the money to get what i want but what i want to know is what is the best 60's-70's show mustangs i want somthing orginal but not too expensive i was thing maybe a GT 500 But those are kind of hard to come buy give me your input