I have the dual channel CDI because I run a dual spark plug head and wanted seperate coils for each plug.
SPARKER DC-CDI-P2 raceProgrammable two channel capacitive ignition
http://www.ignitech.cz/english/aindex.htmBut when I did my last dyno runs I just used a snowmobile single feed dual output coil off the 00-01 CDI to fire both plug.
The seperate channels is like having 2 differant CDI's built into one so the power output should be higher.
If I was you I would look at the Zeelronic setup for the 2002 CR250 flywheel/stator that needs no battery.
If you do not want to deal with them over seas I know a guy on the CR500 forum that has these made up for him by Zeeltronics, after doing the builds for him Zeeltronic starting offering them for everyone
http://www.zeeltronic.com/page/pdci-11vt.php
I should add you can run the Ignitech with no battery by running a capacitor and regulator from the 2002+ cr250 CDI's
It does have a stronger spark with a battery until about 2500rpms then it makes no differance