Iris Species for Cold Climates

I grow a few varieties of tall bearded iris (planted here by a previous
owner and growing steadily since 1945 or 46) and some siberians, but I'm
looking for some additional irises to try.  I have already decided on
setosas as one addition, because they are easy to come by, and look very
nice in the pictures I've seen. Given that I garden in USDA zone 4 and
cannot afford to do a lot of supplemental watering, what else should I try.
 The soil is mostly glacially deposited sand with some organic additions,
so drains well and is neutral in ph.  I can plant in anything from full sun
to full shade depending on where I put the plants but the beds are mostly
full sun.
If you happen to know of sources for your suggestions in Canada I would
accept them most gratefully.

Bob Campbell
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