I use a "combo" case... I have an InCase snap on cover on the back which has two magnets on it. It's always on the device. I use one of the "normal" apple smart covers on the front, but only sometimes. It pairs great with the InCase cover since the magnets on the InCase hold it back unless you choose to pop it off (which is easy since it's only held on by magnets).
This "looks like" the one I have, but i'm not 100%. http://www.amazon.com/Incase-CL57969...ef=pd_sbs_pc_6