You guys are getting me all excited and "needing" an LSD.
There is a thread on rennlist about an $850 group buy for a 996 Helical LSD that seems like it would be very similar to a 986 Boxster LSD:
Anyone interested in a MFactory Made in USA LSD for 996 group buy for $850? - Rennlist Discussion Forums
That pricing drops it down almost into "why not" territory...