I'm reluctant to lead you too much at this stage as I would really like to see what other ideas you might have. For reference, I will comment on your first concept:
I like it. A couple of concerns: 1) I'm trying to get comfortable with the idea of the "AG" coming before the signature; 2) I'd be interested in seeing it after; 3) Curious to see what a color sample might look like.
This is my next concept. 'AG' is given more prominence with actual handwriting.making it more impressive. The last "." adds more impact to the logo. hope you like this. cheers Kam.