Honestly, unless your tracking your car/autocrossing pretty heavily, I wouldnt spend money on a k member. The cost of an MM k member is more than just 600 bucks. You have to buy coil-overs with it, a-arms and the correct dampers for the coil sleeves, if you dont have them already. Just my .02. I have a brembo caliper set and a k/member setup slated next for my car, but it sees track duty/autocross duty almost exclusively. I dont daily drive it.
If your planning to go the k member route, i would just get the aftermarket a-arms, see how you like it, and if you still want more, upgrade later. Also, I noticed you dont have any tires slated for an upgrade. Dont underestimate the power of a good tire. Worth their weight for the right set.
99 cobra- Slow