I agree you seem to be doing your home work. Lots of good responses on building a roller vs buying used. Both make a lot of sense but it really comes down to what you want. Lots of guys like the excitement of having the motor they want built, then installing it and doing all the other stuff. Others just want to buy and go drive. Both approaches are great depending on you. I've had 6 cobras with 4 being rollers the others bought or traded as used vehicles. You can save some money buying used especially in this market but I never can seem to find the combination I'm looking for ie; the motor I want with the color combination. Just some things to consider but the good news is you are ready to pull the trigger after watching and listening for 11 years. I have fun as the whole process is a gas!!!
By the way, great group of Cobra owners in Austin so attend a few of their monthly lunches and discuss your needs and wants.......