The extent of how great a deal you get greatly depends on your own negotiating skills, but here are a few pointers.
Get at least three good faith estimates. Look at each of the lenders fees. See what they are charging you for. Some lenders charge for different things and sometimes they are just termed differently. Don't be afraid to call the lender and ask them what the fees are for. The advantages to having three different good faiths is that you can use lender A's fees to negotiate with lenders B & C and visa versa. Typically your Las Vegas Real Estate Agent will have the know how to help guide you in what decision would be best for your situation and goals. Usually Realtors have very good relationships with several mortgage lenders and will be able to help you better understand where lenders strengths are and how they will be able to work for you.