It's not really about what the doc thinks is good or bad, it's what you think . For example, if a 50 year old man, Norwood 6, came to him with 2000 grafts left and asked for them to be spread evenly across his entire head, then that would be absolutely fine if the outcome was going to satisfy the patient.
As the doc has said, you only have a couple of shots at a HT: 4000 grafts over 2 surgeries. Doing just 1 means you lose the ability to buzz your hair very short.
If you're a good responder to the meds you could opt to have 1 procedure now. Maybe get 10-15 years with good hair until the propecia effectiveness wears off, then go in for your second procedure.
Without the meds you will probably have to go back for 'round 2' in just a couple of years, and with the hairline placement fixed you may not be able to do anything about the crown. (which may be entirely acceptable to you.)
A whole different way of thinking could be to delay a HT for 10 years, then come back and use all the grafts on a conservative hairline which covers more of the crown.
I think what I'm trying to say is that you need a long term game plan.