The best bang for the buck on a complete kit is the Bullitt handling kit. For about $400, the kit comes with springs, shocks, struts, and front & rear sway bars. It only lowers your car about 3/4 all around, but the modest drop means there is less geometric impact on the job the k-member and other moving suspension components do for you. I believe there is a very similar kit marketed as a Mach 1 kit, with slightly softer springs than the Bullitt kit and has a similar drop. If you have more to spend than that, there are great kits out there that will provide 1.2 - 1.5 drop. Be advised, the closer you get to 1.5, the greater the possiblity you'll need C/C plates to get a good alignment. Also, the other moving suspension components will be less effective in doing their job the more you drop. It all depends on what you want, and how much you have to spend.
Pony Ride 2 - 2007 Grabber Orange GT Premium with 5-speed manual transmission