Signed the contract on the new house!!

Congratulations, and I agree about the inspections. Hire an independent ASHI certified inspector that has experience with new home construction. There is a difference between a resale inspection and one done throughout the home building process. So make sure they have done new homes. Typically there should be at least 4 done through the process. Also I know your friends might be doing some of the sub work but it would be good to have a neutral 3rd party telling you that it is being done right.
Good luck.