Flight Deck, but careful on the approach.
Mandible (19 on Fang Buttress) stays very dry if you finish at the retro chains of Wagalak.
i'm sure others can add more
this is a previously posted list for the Grampians - with approx dryness ratings (out of 10):
ravine R side 9
Bundaleer L side 9
Hollow Mtn Cave 9
red cave 9
mt talbot 8
curiosity steep routes 8 (and Axe wall is ok too, maybe 6)
spurt wall 8 (gets zero direct rainfall, but can get spoodgy)
centurion 7? (ok for a few hours but then seeps?)
van diemans 7
olive caves 7
Taipan R side 7 (belayer gets the odd drop though)
The Tower 7
scoop rocks 7?
upper cut lunch 6 (access pitch is a 3)
ruined castle 6? (access pitch 4?)
Cave Cliff / Sundeck 6 (and the lunch cave is a 10!!!)
Flat Iron 6
red rocks steep routes 6