@Thehack did you end up offering these? Hadn't seen any word of it on the web store.
I've got my 200X running now from an SFX PSU, but considering moving to either an external brick (e.g. Dell 280W or similar) or internal Meanwell RPS.
With the 200X I'd obviously need a 12V source, and be able to split the PCIe power from the DC input. With the 300X I could have a single path from AC -> DC -> 300X -> ATX & PCIe, correct?
The wide-band input would certainly expand my options of AC-DC adapters considerably as I could use a more-readily available 19V adapter!