Murray would be incredible but I'm not as comfortable feeling that can happen though it would be the best.
Do see Haskins and Lock in our more reasonable range though I'd have no problem being unreasonable for Murray and like that idea you stated about Quinn as a tool to move up. I've moved Lock into my next preferred spot slightly over Haskins due to Haskins having a much more solid team around him and like what Lock did under more difficult circumstances...
But anyone of the three.
Don't think that he's got to be that super duper top of the NFL QB like to many in here are looking for, but more has all the essential tools of quality to be depended on, consistent and largely effective.
So not expecting a Dan Marino but more a Bob Griese quality
Oh ya really like McKenzie in their to help evaluate players
Quinn absolutely has value to a 4-3 team needing an edge rusher.