The megasquirt ECU kit is very expensive at ~$140, but everything else isn't too bad. You should be able to get everything else used for about (fuel pump for ~$30, the TBI setup for ~$40, both used, and the wideband sensor for ~$60 new) $130, or less if you shop around. I dunno if it's economically worthwhile paying $200+ more to be able to tune for all the different engine speeds/loads, but it could be if you put enough mileage on the bike. Even if the difference is only 55mpg versus 45mpg w/ the auto carb, it would still pay itself off in ~20k miles.
It would probably be best to see what you could get w/ a cheap auto carb first, then maybe go for the TBI setup if your results aren't as good as you hoped for. Everyone hates their customers these days. I called after my door lock went out and Toyota was asking $800+ for it. Over $1000 for the door card.
