You have to make a decision now: Wanna become a Master and more,
spend 50 bucks or more in the game, or wanna play low-level and as a TP
as long as possible?
If you want to step up in the game, I'd propose a full step, not a half. There's some consent that these are the premium clubs in the game:
(L32 R11 -) L59 G20 - L79 Bladez (L83 G20) - L90 R11
(XPs: (12,900.) 88,500, 200,000 (255,000), 487,000)
Thus, the G20 might be your next buy, either in steps as single clubs or as a full set.
Continue with a 100 yds wedge to fill the gap, as expensive as you can bear - the Ping might lack the desirable stopping power.
Take into consideration that custom balls are a logic consequence of the iron buy - Tour SD (65 crs/sleeve), Srixons (180 crs?), Callaway (250 crs) on the lower end. This for improved spin and slower meter (cheaper WGT balls will be helpful, too).