Sandy, as someone who represents many builders and customers, the basic answer to your question involves protecting the value of your investment, and to insure the quality of your new prospective home. The quality issue can be researched and answered by hiring a certified home inspector (prefer certified engineer), researching any complaints on the builder from the local home building association, or better business bureau. If there are complaints on the builder, you need to be realistic if they were an isolated incident, or a continuing problem. Regarding price within the community, is the Builder being realistic with the market in your area? if you do not know the answer to this question, or do not feel confident in your knowledge, then it is time to help get you educated on the market by consulting with your own buyer broker representative. Upon engaging your buyer broker representative, you need to explain your desire to purchase the new home, and discuss the intentions for your current home. Have your buyer broker research and provide you with recent sales in the community, not to exceed six months previous if possible. Equally, as decreased builder sales volume has questioned some builders ability to continue in the future, added protection would be to request a third party home warranty product to be purchased by the builder as part of your sales offer, to assist in protecting you from any maintenance concerns should your builder incur financial problems during your first year of ownership, or longer dependent upon the warranty product provided. Hope this helps.