Ethical Dilemma

So I have an ethical dilemma. We have a room for rent at the moment - I find having a house mate helps while my husband is away. It makes me feel a little more secure, knowing there is some one else in the house besides me and my young daughter.

So, I advertised the room and had a few no shows, then had an email from a fellow in the US who will is doing a double major (poly sci and geography... go figure!) and needs a place to stay for a few months. We talked on the phone and I said he needs to mail me a cheque for a deposit. He probably already mailed the cheque, but since I haven't received it yet I left the ad up for others to reply.

This evening I get two phone calls from doctors who are taking a one year program where I work (I work at a hospital). One fellow is from Vancouver, so there is a connection there (my husband and I are from Vancouver). The other lady is from Toronto. Both are coming by to look at the house, both are interested for one year.

So, my ethical delimma is two fold, one, we may end up getting a posting message saying we're moving this summer, which would lead me to pick the guy from the US as he would only need the room until late Spring. Then again, if we don't get posted it would be nice to have the room rented out for a full year, and to someone who will be going to the same place every day as me.

Decisions, decisions!