Hearthpwn

I've opened around 150 packs in Un'Goro and used Hall of Fame dust. Atm I have pretty much everything, save for 3 or 4 bad hero quests, Spiritsinger Umbra and some fillers, most epics etc. Currently I've preordered 50 packs, already have 3 from quests, sitting on 2k gold and 2,4k dust (burned 3k gold for no reason a month ago - don't play after drinking, kids...). I think it might be just enough, however I intend to burn my gold on arena runs instead of buying packs this time.

40 packs + doing adventure wings might get you 1-2 playable decks, or even more if you have a decent collection. You'll have 2 guaranteed legendaries (first 10 packs + hero card from adventures), so if you get lucky you might have a very nice first day in KTF ;)