Doujindance does occasionally sell the original black Duo's, he does recap them but only the audio caps and ones related to the CD, he doesn't do the entire system. Not sure if this will be a problem or not in the long term. The good news is that he sells them cheaper as there's not as much demand for them.
I do like the original Duo's and wanted one for myself, but I ended up with a Duo-R as that's what was available at the time, and I think they look nice in white anyhow. It hasn't arrived yet but should be here tomorrow or the next day.
Re the region mod, what's the difference between an analog and digital switch?