The Acura NSX kit complete uses around 745 LEDs, and I charge $700 shipped to the NSX customers. The price is reflective entirely on supply costs and the amount of work I have to do to make them. I do not drastically mark up the NSX community, it is all reflective on those principles.
Based on taking apart the SVX taillights, and guesstimating the amount of LEDs I have used on the NSX vs. the amount I will use on the SVX, I assume a price range for a full LED taillight conversion kit to be around $500. This is just a rough estimate for now.
Here is a link to my DIY LED kit for the Acura NSX:
http://www.nsxprime.com/forums/showthread.php?t=125941
Also, I want to add that I live within an hour of Seraphinwolf, so I can test out the final product on his SVX.