Larry, you haven't made a mistake. Alec is in the UK, where the Midgets got a very, very, very different selection of carbs. I'm going to assume that he didn't notice you were on the other side of the Atlantic. Either that, or he's never owned a car with the Z-S 150CD and that godforsaken water choke.
The DGV isn't a bad choice at all. Many will tell you that they prefer the Euro setup with the twin SU carbs. Either choice is miles and miles better than the choked-off, imprecise, hard-to-tune, expensive, restrictive P.O.S. Strombergs.
Best,
Duncan, Ottawa