If you want to build some kind of approximate mental map of blades, and how they relate to each other, look at ttgearlab.com. But you already narrowed your focus. I think your range is very good, but it is actually pointless to say. Also I only speak from my very limited knowledge, because there are thousands others.
I'd also buy the cheaper version first. If I want to try Long 5X, I'd buy DHS PG5X or Fang Bo B2X, if I want to try Viscaria, I'd buy Yinhe Pro 01 ALC, as Kuba suggested. Or buy both - that is the only way to be sure.
I have a question. If you buy Long 5X, and you like it, will you not have a doubt now, that Viscaria feels better?
Here is one thing I'm not sure about - I tried DHS PG5 and I didn't like it much (I don't regret buying it), never tried Fang Bo B2 or Long 5 or Ovtcharov No. 1 Senso. Perhaps it was just my blade, or perhaps it is simply too cheap. I just want to warn you, because also maybe DHS PG5X will be worse than its more expensive mirrors.
Can someone compare DHS PG5 with Fang Bo B2 or Long 5?