I agree $15/ft sq is a pretty good ball park price.
Be wary of working for out of town (or state) GC's they know they won't be back and will stiff you every chance they get, whether it's in writing or not.
Never sign a no-lien contract.
Cross out the non-performance contract part where the GC can hire a replacement electrical contractor and make you pay for his work and warranty his work.
Read that stuff carefully.
