Not having the plans to look at, here's a couple of the top of the melon...
What type of wiring method? Romex? EMT? RMC? K&T?
(That was a JOKE BTW
Height AFF for switches / outlets?
Ceiling fans in any of the rooms?
Time frame from start to completion?
Nail down change orders - who can and cannot authorize, and adjustments to the original bid for additional work.
If you can arrange payment for supplies before work starts (as a deposit), AND keep a lein against them until payment is completed, that's a good start (dunno how your credit is with your supplier, but I work mostly on a cash basis, and include this clause in my contracts)
Search the General Discussion posts for contracts - there are some tricks, and subtle differences in wording can make the language work for
you, or against you.
One-Upmanship? Offer supplemental or isolated grounding and 4-receptacle boxes where computers will be installed in the house. Offer to run cable / phone / data lines to all the rooms... multiple points in larger rooms (living room comes to mind).
Offer to run circuits in the Basement that are "finish ready", in terms of capacity and spacing - maybe even "set" for easy installation of can lights in the future.
There are lots of little tricks - tell 'em you're providing the best service for a fair proce!