Proven 12 second combos and drag radial sizes

I'll be ordering my '05 GT in the next few days (which will probably be an '06) and I'm looking for some advice. This will be my 4th Mustang and I'm looking to make this one pretty versatile. Road Atlanta is only 10 miles from my door step so I'm sure it will see some track time, but I also enjoy drag racing.

For the road course, initially I'll be adding 18" wheels and sticky tires, 4 piston front brakes, springs, and adjustable shocks. As always, there will be more to come but that's a start. Any advice on parts that work in this department are more than welcome too.

Where I really need advice is in the power department. I want to know what combos are proven to produce 12 second et's. I'm looking to be solidly in the high 12's, the 12.70 - 12.80 range would be perfect. My '99 was supercharged, but I think I want to go NA this time. I also want to put drag radials on my stock wheels, so I would like to know which one's are working good these days, and what size works best for the '05. I know this is somewhat track and driver dependant, but get me in the ballpark.

Thanks to all for your help. I'm looking to stock pile the parts and bolt 'em on the day she comes home. Why wait?!? You guy can help me spend $5K in the meantime...

Thanks for the comments. The Procharger sure does look tempting, and I might hold off on the engine mods until I make my final decision. I'll follow the boards to see how these things work for daily driving. A 12 second bolt on NA car sounds tempting too. Decisions, decsions...