Sigh. There isn't a whole lot of selection on my local Craigslist. I'm going to check out the non-profit bike shop this weekend and will keep my eye out for any used Electras.
If I were to go the Xtracycle route eventually, it would be because the 4-year-old outgrows her current rear child seat, at which point I would probably opt to add a Free Radical to whatever bike I end up with now.
Re: the Windsor...I'm 5'9", but with short legs, long torso. I'll keep it in mind.
FWIW, my dream bike is a Workcycles Fr8. But, $$$$...yeah, way outta my league. I'm basically looking for the poor (wo-)man's version of that: slack geometry, long-ish wheelbase. Might have better luck finding a unicorn, methinks.