05 gt springs
 

I am trying to firgure out what would be the best springs to lower my stang and how much can I go without haveing too much trouble with aligment.

depends if you only want springs... or if you are willing to buy shocks which will improve alignment and maybe even sway bars...

i'm not sure what brand is the best... however i have full eibach suspesion, its dropped near 2in and i love it (i have swaybars, shocks, springs)