Dr. Keene is the best in the US if not the world
You are in very good hands. I had two procedures with her. You will not be able to find the scar on the back of your head 4-5 months after the procedure. I had a 1300 graft procedure and a 1900 graft procedure. The 1300 graft procedure was much more less uncomfortable. The area will be pink for a few months after the procedure, and hairs near the donor strip may go into shock and fall out temporarily, making it look like there is a big scar back there, but you will clearly see the pores and know it is not a scar. In 4-5 months the area will fill back in. Do not tilt your head down for 6 months. You can get away with it a little, but you need to minimize the tension back there to have the smallest scar possible. I don't know of any other doctors who use 19 inch computer monitor screens to view the donor strip, or only take out a little at a time. If you go to bosley or a $3 place you will pay with your scar.
She is right about not going over 30. Not only would there be shock to existing hairs, you could kill donor hairs as well unless they are very fine. Dr. Keene does not adise going in between existing hairs. Neither do I. You can grown all those out. Read my topical dutasteride posts. It will be 6 months before the hairs grow out fully and a year before they reach full thinkness. This is similar to drug regrowth time frames if you respond well. Definitely fill in the empty scalp with 30/cm2, and maybe let her do 12 or 15 in the other areas if you really want, but don't push it on her.
You also should start thinking about what hair line you want. The one she suggests will make you look better than you currently look, but I did not like the one she suggested for me. I drew mine myself and she filled it in where I specified. Had I not done my research, I might not have known what would look best. If you are going to pay all this money and want every edge possible getting women, you need to pick the very best hairline for you, and not just take one that looks better than what you have. If you don't have much donor hair or have a lot of area to fill, your options will be more limited. Doctors are much more skilled at doing mature hairlines because that is what most guys who can afford hair transplants get. For a NW3 like myself trying to be a NW1, the doctors are not quite as skilled. She seemed confident when she drew the line, and maybe she was right, but I'm VERY happy with were I drew it. I just need to lower it a milimeter or two in corners on my next visit.