The Wyeast 1010 American Wheat is rated for the low 70's. It's what I'm fermenting with right now. Actually, I'm right on the edge at 74 degrees, but it was the best I could do with. It's my first brew, so fingers crossed.
Wyeast 1010: http://www.wyeastlab.com/rw_yeaststrain_detail.cfm?ID=126