What about the Roush trak pak driveshaft? I hear those can be had for pretty cheap as they are being cleared out.
have a link? i would like to pick one up cheap. 
I installed my coast shaft about a year and a half ago in my garage, and made about 200 1/4 mile passes with it. Haven't had one problem with it, the car feels smoother and I picked up about 2 tenths at the strip. Money well spent .
As I understand it, we have two-piece driveshafts. Why? I thought only trucks with really long drive shafts needed two-piece to keep from whipping.