I know it is hard to really take a good look at whether or not to add on to your home or move out into something bigger. This is something you really should take a good look at. One may be a smarter decision financially than the other.
Do you love the neighborhood you are in but need more space? It might be smarter to remodel and stay or if you really want to leave, it may be smart while the market is slow, to rent your home out before selling it.