My favorites change from month to month.
Yours probably will too. So, just collect as many as you like.
This month I would list them in order of preference as:
1. The BSS's (along with several of the add-ons)
2. The Goodtimes / BBH Firms (those in between the Classics and the BSS's).
3. The compilations like Upper Body and Standing Legs.
4. The Classic Volumes 2 and 6.