I agree with Emily. How confident are you that you won't have to bring money to the table to sell? Unless you have a fair amount of equity, that could be a concern as well--in addition to carrying costs. I sold recently myself, and while I got a small amount at closing, I did sell for less than what I bought the house for in 2002. It hurt.

If it were me, I'd sacrifice some space in the short term until you're able to sell.