Man, I have 51 KFT, 87 Un'Goro, and 3 Classic packs waiting for expansion, plus 4800 gold. I'm probably going get like 200ish packs after the expansion as well. I've been thinking I'll just get the 50k Amazon coins for $375 and get somewhere between 120-200 packs, then save the rest of the coins for the next expansion. It makes it like 94 cents a pack vs the $1.17 if you do 60 packs in game. Even better if the coin back deal is still going after expansion launch (is it even still going now?). If I'm going to buy packs anyways it makes sense to save like 25%
Should make me pretty good on expansion. I'll open the Un'goro and Classic packs first, then craft any legendaries I'm sure I'll want golden, then open KFT packs.