In your place i would probably do long term investments when it comes to wild. Aggro decks are cheap indeed, however they are also the most unsafe to craft. If you have most of the standard cards, that means that you probably have: Bloodmage Thalnos, Zephrys, Polkelt. Those are 3 cards used in Reno Priest, which is currently tier 1 deck and i don't see them nerfing it soon. Even if they nerf it, they will just try and decrease win rate of the deck, they won't kill it.
My suggestion for craft would be:
- Reno and Kazakus (Those two are very important cards for Reno Mage, Priest and Warlock).
- Raza and DK Anduin (Those two are important for Reno Priest).
That is 6400 dust, you can use rest of the dust to finish cards for Reno Priest and later gather dust for other two Reno decks (Mage and Warlock)