I am going to build some POV devices soon. Just PM me Your email, and i will tell you details on progress. Price will be little higer (cant tell it now) than Spokepov kit (witch is $99 for 3 boards). My version will be smarter with more memory. (8 images, 3 animations(16 frames each), km/h(mph) mode, and "blink" mode. Rechargeable battery and charger included. And ofcourse you will be able to modify images, animations, settings (magnet position, wheel size, which modes to display, mirror text or not etc). PC side software is not fully finished, but already its working, just not very user friendly =].
You can check my homepage for updates, i will put the info there.