Yeah start with a 3 way BA. Single and dual BA's not really worth it as the price differences between 2 and 3 way BA's usually small but hits fucking home run when you start looking at 4 driver or more the price just shoots upwards really fast, unless you have golden ears. I'd say go with the 64 Audio model, they've been around for over half a decade and have solid reviews for models released every 1-1.5 years. It's still shit house that we don't have as many of the brand and manufacturer offerings available in Asia and the US market. The CIEM presence in those regions are fucking huge.