I've been researching this topic for about two weeks already on this forum. The general consensus has been that granny smiths are a good base (50-60%), pink ladies give a good sweet character, and avoid too many golden delicious (I have about 10% collected in my 5 frozen bushels while I wait for the temps here to cool down for fermentation. From what I have read, they're really only sweet and don't offer any body or tannin flavors, but I'm guessing they'll be an alright filler). As for fiji and gala, those two are my favorite eating apples, but I haven't found anything about them for cider. My apple bill is about 50% Red Delicious, 40% Winesap, and 10% Golden Delicious. I was considering adding maybe half a bushel of pears as well?