I know BA driver only models are not meant for bassheads but id like to be able to upgrade them down the line. Reshells only work on BA driver models and at that point I'll add a dynamic driver. What are some models that have more punchy bass they achieve through multi drivers. I like v shaped sound signatures and wide a wide sounscape. My music is all played on my lg v40 either flac or steam high quality spotify. My budget is 350 and I'd prefer used pricing.