No balls IMO - you'll give WGT a weekly rent: They wear and get lost in water and rough.
A low wedge will be helpful eventually, as will a longer 3WD. OTOH, you may buy length but not skills. As long as your avg exceeds 80 (maybe less) I see no need for any custom clubs.
The budget way will be to wait as long as possible with the buy - on most levels there will be better clubs...
Also, wait for free rental weekends to try the clubs.