Snuffers, VPA's, Magnus, Zwicky, Simmons, Eclipse, STOS, etc. should all be fine. If you want single beveled heads, the Grizzly broad heads will probably be just fine.
My personal experience is with Magnus stingers(super tough) and Simmons Sharks (also really tough). I've never shot an elk with either but I've hit enough hard objects when missing racoons and other such things, to know that they are both dependable heads.
Others with more dead elk experience will chime in soon I'm sure, but from my rifle shooting days, shot placement is king on elk. The ribs are easy to punch through, the shoulder will absorb way more energy than your bow can deliver.
You have plenty of horse power to shoot just about anything you like at an elk, so pick a favorite head and go get em!