5/1
I've spent a lot on vape gear in the last 15 months; and even though it was a lot, it was spent as wisely as I could spend it. Even with all my research, frugality and restraint, I now have only two toppers I feel like I couldn't live without: The KFL+ clone from Boge (which is more like a Russian), and the Derringer clone. I have and use other gear, but those are the two things I would immediately replace if lost or damaged.
That said, I'm really wanting to upgrade to a tank made of glass. I've been stalking the Lemo V2 as the most likely purchase, but the Kayfun V4 clone is cheaper and slightly better looking IMO. Decisions, decisions. I'm also looking at the Freakshow Mini, since it's very similar to the Derringer in design.
ETA: Congratulations to the contest winners!