Good choice mate, 16's are a nice size, 15's are nice but the size of the Aerodeck can make some styles look too small, especially dished rims. 17's look ace, but think they can be just a bit too big (just my personal opinion).
Those Watanabe rims look epic! Similar style to what I want for my mk1 mx5 (will just be 15's for that though as big rims on the mx5 ruin the handling that these cars are famous for). That deck looks amazing on them eh!