Buying/Selling Home.....what do you think?

We currently have our 3 bed/1 bath full basement home for sale in Wonder Lake, IL. It has a fenced, large, wooded yard. It's been on the market for about 1 month and is very competitively priced. However I know the market is BAD right now. My question is this, we have found a home we like that can be built in about 5-6 months. Do we put the earnest money up to get it started or just wait?