I just purchased a B&M short shifter kit from "Bumperplugs" for about $250 including shipping. The installation was pretty straightforward with the biggest issue being when I dropped those little screws down inside the console while I was putting it all back together (I got really good at removing/installing the console! :roll eyes: ).
The short shifter eliminated the slop in my 2003 Boxster Basic's (51,000 miles) linkage and makes the car feel all that much "newer". I may not be racing my car, but it definitely feels "tighter" each time I drive it!