We don't do this sort of personalized recommendations here.
I am sure I have seen a post somewhere that suggests the preferred orser for badge upgrades but I can't find it anymore or I was imagining it!
I've used my first 25 badges on the Ward of the violet citadel. I am coming up to 40 badges soon and am wondering whether to keep saving for the chest or whether to splash out on trinkets?
Current chest is [Pattern: Ebonweave Robe]