I'm wanting to get to at least rank five (though my real goal is legend). I have around 7,000 to 8,000 dust to spend. I don't care what class or style it is as long as it can get to at least rank 5. (I want the best deck not just a random deck that can get to rank 5)
AFAIK, it's better to wait for meta to settle down before crafting decks, if you have limited resources, as you do. Meta will shift.
If you are unpatient, wait 7 days than check metastats for best performing decks in the past 7 days. But beware, meta will most likely shift. Tier 1 deck today might be T2 or T3 deck in a couple of weeks.