Hi Caleb!
The three questions you could ask yourself are:
1. How long have I followed North?
2. Who is my favourite player?
3. How much do I want to spend?
For example, Brent Harvey would be a good player to focus a PC on due the number years that he has played and therefore the number of cards and different inserts of his that there are to collect. The great thing about Boomer is that you are basically guaranteed that he will be a one-club player too so EVERY card of his will be a North Melbourne card.
I am going to start doing the same thing with Brad Sewell from Hawthorn.
Hope the advice helps!