Zona,
You may already have found this out, however for the thread, I can tell you that most builders do not have an architect on staff. Most will build from stock plans and modify them, which is fine for 80% of their clients. If however, you are seeking to integrate your plan with green building design (i.e., site orientation, PV, etc.) beyond materials and equipment, having an architect work with your builder can pay off greatly.
One of the hangups builders and some new clients have about architects is that they drive up the costs, that is not always the case. I believe that you need an architect or highly qualified designer to do more with less. I have designed some great homes that were smartly arranged and took advantage of newer trends (materials/finishes/equipment)in kitchen and bath design. While it did take a couple of months more to start construction, it was worth it. Call or email if you have any questions.
+pablo