Your home is often the biggest investment you will make. Naturally, it makes sense for you to use a Realtor whom you you can trust to guide you through the entire process - and it costs you nothing.
Your Realtor can help you in many ways, such as offering local expertise on neighborhoods and schools, pointing out ancillary costs like HOA dues and taxes, determining market values, negotiating prices and concessions, offering reliable contacts in the lending/inspection/insurance sectors, and making sure that you find the perfect home that fits your needs so that you don't suffer from buyer's remorse down the road.
As emphasized in other answers, the job of the builder's salesperson is to sell the home at the highest possible price. The choice is obvious: choose a Realtor who listens to your needs and represents your best interests through the entire transaction - all at no cost to you.
Please call me and I will be happy to share why so many other buyers choose me to get them the very best value on the house they will make their home.
Keller Williams Platinum