I believe they also offer a catalyst version for those bikes that came with catalysts (to keep things legal with the EPA I would guess - wonder how many they will actually sell?). Maybe that ridiculous $750+ price is actually for the catalyst version? If not, I think I would add a few bucks and buy a complete system from D&D (FatCat) and let the folks at V&H keep their slip-ons.
I know steel prices have risen dramatically in the past couple years, but $800 for two simple mufflers is the kind of pricing strategy that would make the greediest bastard on Wall Street proud. Maybe they still think we are in the sweet spot of the bubble economy, where people seemed to think spending much more than something was worth made them cool / hip / whatever the latest word is. I believe you will see a radical change in that suggested retail price in the near future, as well as steep retail discounts from the big dealers. In other words, for those who really want them, a little patience may save you a significant chunk of change.
Jerry