I'd go with Ramo. I'm playing him in some DFS entries today. I don't think the Sharks are going to risk too much tonight with their playoff position already sealed, but Niemi is also getting the start. The Avs have been red hot and I expect them to score, but I could also see this as a 4-3 type of game.
I like Ramo at home. The Flames are a team that works hard, although with limited talent. I don't think they will fold up shop. They are also pretty decent favorites in Vegas too.