Yeah, the Como isn't a mountain bike by any stretch of the imagination, but it's cool that you're willing to push the envelope with it. You didn't mention your actual size, but all legitimate manufacturers publish the recommended rider size for their bikes. It shouldn't' be hard to figure out a bike that's in the ballpark for you.
You mentioned "standover." I don't think I've ever had a bike where I could hold the bike perpendicular to the ground, with my feet flat on the ground, and not have the top tube contacting... umm... those body parts that I'd rather not have in contact with the top tube. You learn to handle the bike in a way where that isn't the primary consideration.
Start by looking at the brands that are well represented in your area. Specialized and Giant are the big dogs. Boutique brands located on the west coast are Santa Cruz, Ibis, and Pivot. All are good.