I also posted this question on powerstroke.org... so you may see it twice:
soooo......
I saw that Beans has theirs for a hundred bucks:
Beans Diesel Performance - 7.3 Power Stroke IDM Modification (Powered by CubeCart)
and Swamps has theirs for $275... They say they have increased the "potency" of the IDM, by not only increasing the output voltage of the IDM, but by also increasing the frequency.
Whats the heck does that mean and is it worth the extra 175 bucks?