House prices have started to fall again after a little stabilizing, I think the fall will continue but not by a fantastic amount.
If I had a pot of money to buy, I would think now or in the near future would be a good time to buy, but it's all relative.
You are selling your house which will be effected by the price drop too.
But the simple answer is if you can not source money from elsewhere, you will not be getting a bigger house, unless you move to an area that house prices are lower or you buy a house that needs some work doing to it, ie refurb/modernizing.
So renting may be your only option.