Hello,
I also have to say that I like the live version from the Elevation Tour best. As for which show, I don't have a preference. IMO, all versions of that tour are of a constant quality. Maybe the earlier ones are still a bit shakey, but for the rest they sound really good. So yes, I would also go with the Boston DVD version (although there are also some great quality bootlegs with The Fly on it).
C ya!
Marty
P.S. I still think that the ZooTV version was more a visual than an aural experience, i.e. you had to see that song live, but not necessarly hear it.