I'm a bit late to the thread but I though to share my experience with the
Crane Cams XR700; it's a points-to-electronic conversion kit for your existing dizzy. Costs about $100 or so and if your dizzy doesn't have any mechanical problems then I'd recommend this option!
Easy to re-fit the dizzy with the hall effect sensor and control module; combined with a ceramic ballast resistor and high cold-cranking amp battery, there's just oodles of power when starting, cruising, climbing and pulling off the line.