That's a decision only you can make for yourself.
There is no 64° PM Grind wedge, and the 64° wedge will quickly become your go-to wedge for almost all green-side shots and other shots inside of 60 yards, so I would definitely suggest picking up the 64° Vokey wedge no matter what.
Beyond that, it boils down to this decision: Do you want all of your wedges to match? If so, go with all 3 Vokey wedges (56° - 60° - 64°). That will give you consistent spin and meter speed and consistent 60 - 75 - 90 yard spacing.
If you don't care about all 3 wedges matching exactly, the 56° - 60° PM Grind wedges will give you a little more spin (3.7 vs. 3.5) and a little slower meter (4.0 vs. 3.5) for only 100 credits more. Your spacing would then be 60 - 80 - 95 yards.
Forget about the 52° wedges, you don't need those.