First of all, let me thank everyone for the thoughtful responses. Managing our current house from afar, if we do relocate, doesn't really concern me because we have friends who could do repairs on an as needed basis, and the house is relatively trouble-free. Of course, that can all change if I don't find the right renter, but that's a discussion for a later time.
As for the question Greg_home123 posted about how I'm determining value, I used Zillow.com, took the value they gave me, which represented about a $40,000 loss (a little less than 10%), and then added back some things of value, such as the lot, condition, etc. Basically, we made a hasty decision and overpaid on this house a year ago, at a time when a number of personal circumstances forced us to act more quickly than we would have liked. I'd be happy to get into more specifics on a private basis, but for various reasons, right now I'm a little squeamish about baring too muich of my soul on a public forum.
I suppose the biggest factors right now are what we'd be able to get for the house if we sold it, and what we'd be able to rent it for. I guess I really need to do some homework.