I think the question of what to buy is specific to the individual and how they collect. There isn't really a right or wrong answer regarding what coin is out there to buy. I understand that for the uninitiated buying the highest quality you can afford and sacrificing quantity for quality is the rule. But once you understand the dyanmics of the market (at least a little bit) each person makes the choice to collect as they find the greatest satisfaction for themselves. For me, it will be collection sets for the forseeable future.
Perfect for you doesn't have a specific grade. I have many customers who consider VG or F to be perfect for them. You mention that some of your set needs upgrading. While your decision of grades may change, over and over, a overall system should be decided. If that makes any sense. You should put your atta-boy back.