Well it has to be what you will feel most comfortable with Gregory.

I don't know how difficult it is to do an official change in the US, over here it can be done by deed poll but it doesn't change details on a birth certificate.

I have problems with one simple letter. Some systems have me as Trefor and others as Trevor and the ones that have the v say they can't change it. All because a a registrar couldn't do Welsh spelling and he had a Welsh name himself!