You're in Des Moines?

Wouldn't this work better for you?

Honestly, at 230Lbs, anything with 28-32spoke count rims will hold up if you keep them trued by a "true" wheel builder.

It basically all comes down to what geometry feels good to you. If you plan on going off any paved trails-roads, then road and hybrid bikes are just about out as an option. I used to commute those distances during college on a Schwinn Frontier MTB with slicks. That bike is a heavy beast and I look back at those times seeing how much energy was wasted to ride it on the road.

My suggestion would be to get a good hybrid or road bike for the commute/errands and maybe a 2nd-hand mountain bike for anything else (like a Specialized Hardrock).