Good deal on lowering my 06 Mustang GT

I would go ahead and do shocks/struts and a pan hard bar for eibach springs.

Probably not the answer you wanted to hear but that would be the smartest route. It's going to cost a lot more for labor when you have to turn around and put the shocks/struts on later. Plus you'll enjoy the ride quality better with some adjustable Tokico S/S.

My car is lowered with steeda springs and it threw my rear end off, so my car definately needed the adjustable panhard bar. And mine has a milder drop than the eibachs.

I paid about $1200 parts and labor for the said mods.

there are two different eibach drop kits for the S197. a pro kit that has a mild drop, and the sportlines which is a very aggressive drop. the sportlines will require more parts to properly lower your car.