yea, I'm in a wierd spot now. I want to use the dust to make neutrals that I want/need (Faceless, Knife Juggler, Pyromancer, Auctioneer etc).
I think my best bet is to spend some $$ on this game and then buy a bunch of packs and see where I am at after that.
I spent $10 on 7 Packs just to see what I got: 1 Epic, several extra Rares. Spent another $10 later and got a Malygos with the last pack, some Epic and a few golden Rares. Filled in a lot of the decent to good commons I was missing 2x of as well.
I lost 1 Pack by doing it this way, but it let me do a batch of opens, see what I could make and then decide if spending more was worth the chance. Unless you feel like dropping $50 of course, I think it's a good route to go.
The changes to rerolls made the daily grind a bit more irritating, otherwise I probably would have just chugged along buying Arena Tokens as I could.