I am probably going to ask to pick her up at the 9 week mark, I have two weeks off at the end of August and I just think it will be a better time for all of us if I can spend as much time as possible with her in the beginning.
Once you get to 7.5 to 8 weeks, the next biggest impact is your interaction with your dog.
So to the OP, 7.5-8.5 weeks is a safe range on either end to pick a puppy up in my opinion. So what I would consider is what would coincide best with your vacation. If you could pick him up at 7.5 weeks but might still have a couple days of work, you might consider picking him up later so his first experiences with you can be very closely monitored.
I think this is more a question of at what point can he be worked in most smoothly rather than exactly what day age.