If you live in Atlanta and your interest is to purchase a home is a very desirable community, your best bet is to eliminate a financing contingency. However, I recommend that you keep your inspection and appraisal contingencies. To do this without putting yourself at risk you must secure a loan commitment prior to shopping and ever presenting an offer. Your loan commitment will trump a competing offer's pre-approval letter.
However, even with new homes, there are two contingencies that should almost always be included. One is a home inspection and I recommend that you handle this within 12 days+-.
The second is an appraisal contingency. If you are purchasing in a seller's market where several offers push the price over the asking price, the home may not appraise and you may not have the cash to handle the difference, in which case the opportunity to renegotiate will be important to your success. So, check with your lender to find out how quickly the home will appraise, add a buffer of a few days and that will become your financing period.
Be careful and have fun finding your new home. Best of luck.