If you can afford a ball that significantly slows down the meter (like Cally slow meter or Nike RZN), then you should definitely get Rocketbladez, not G20 (wood and driver can be G20, hybrid isn't necessary). Then highest level Cleveland wedges (64, 60, 56) and you're set.
Regarding balls, out of cheap(er) ones GI3-S would probably slow the meter enough for the G20s (and maybe even for Rocketbladez, if you can manage relatively fast meters, as you seemingly do now...)
Btw, if you won't have enough credits for the time being for everything, you can buy only the (much cheaper) wood first and use it as a driver - being Tour Pro that's totally sufficient, even in the Master/Tour Master tiers it may work ok...