I ended up buying an Iroquois MkII this spring as well, for fairly cheap money. Needed (and still needs) work, but she's sailing now, took her out for her maiden voyage last weekend with Sailingdog.
They are 30-40 year old boats and will be priced accordingly. I expect an average condition Iroquois will sell in the mid-$20k's and a bristol condition one higher. All my research shows them selling around those prices. Of course my purchase & darwinless's will drag the average price down now