Oh, I LOVE being enabled!
I've never seen a wisteria growing in Michigan (I was raised in lower Mich., but now live in the upper peninsula), but have recently found that wisteria is native here
So, I bought this 'Blue Moon' variety, which is supposed to be hardy to zone 4. Anyway, I went and checked out the arbor today and it looks pretty darn nice, so I'm going to give it a try -- but I will take your advice about letting the trunk get stronger before I let the plant grow tall (if I can contain my enthusiasm, that is), and hopefully it will work out. At this time I just hope the poor thing survived last winter, and next we'll see if it makes it through NEXT winter... (that pretty much defines my life up here, actually...). Oh well, there's always clematis to fall back on!