I'd find something more tight like Census designated locations or something. Moderators having to move threads around is a hassle for you guys and annoying for people who post threads because then they disappear. States like Nebraska, Arizona, Indiana, Kentucky, Tennessee, Idaho, Oregon, etc just don't have clear cut locations. Alaska and Hawaii would have to have their own boards for their own time zones.
You're only five or six states form having fifty states listed, and the way it works now it is clear and apparent where things go, which I think should trump arbitrary aesthetics.
Clear descriptions are important. A usable board with clear descriptions is better than a pretty but confusing board.
Alaska, Hawaii, Oregon, Idaho, North Dakota, South Dakota, Nebraska, Kansas, Texas, Michigan, Indiana, Kentucky, Tennessee, and Florida all fall into multiple time zones (or have their own time zone) and for people without a time zone map in front of them there are several other states that could be questionable (as well as which time zone do any of those states fall into)