We didn't have that option here in TX. You can't be your own GC here.
My advice if you do hire a GC, watch them like a hawk. If they do something you don't like, make them redo it then, not later.
Also watch out for them cutting every corner that they can. They will try to get away with anything they can.
We built ours 7 years ago this summer and had a pretty good custom home builder. My MIL/FIL just built a big house with a very good GC. Both cut corners where they could. We (FIL/MIL and I) all had them redo things as it was being built.
There are some pretty good books available for first time home builders/buyers that tell you what to look out for. We bought ours at Home Depot or Lowes (I can't remember now).
Good luck, and you will love it. There is nothing like living in a house that is built the way you want it!
Brian