http://www.youtube.com/watch?v=7lJlUPEsL_c

Various models, single programmable, no sensors or pre-graphed curves,
up to 4 curve version, 1 to 2 sensors inputs to trigger functions in ignition
and other stuff.
A Maxed out a kit with coil < $500

Ends my decision which curve is best, just roll my own to fit.

hobot