Echinocereus reichenbachii v. albispinus
Pediocactus simpsoni v. minor
though if yah have something else that is hardy to zone 3 or 4 i would entertain it....
i have access to Escobaria (Coryphantha) vivipara for trade....also have other hardy perennials, prolly one of the more interesting natives is the Prairie spiderwort(Tradescantia bracteata) which is nearly as nice as any cultivated Tradescantia variety.....i could also work on rooting some weeping mulberries.....anyways if yah have any of the real hardy cacti contact me with what yah got and i can put together a more complete list of what i have.....may have some CP's to trade aswell if yah have some interesting stuff....
also interested in hardy irises for the same zone 3 or 4........i prefer blues and purples but will consider most any