I think the Vortex SPARC is nice, and I would assume the Vortex Strikefire is a good product too. I have since upgraded to an AimPoint PRO and haven't looked back, so maybe I'm a RDS snob... but this was for an AR-15 build of mine. I think the SPARC could be mounted low enough to have a nice sight picture/cheek weld and it's tough enough to work well on a Mossberg.
"There is only one kind of freedom and that's individual liberty. Our lives come from our creator and our liberty comes from our creator. It has nothing to do with government granting it." ~Ron Paul
"Life is good" ~Hickok45