Black Gate is dead...Been hearing of this one for a while. They are nice caps.
There are many options for capable designers though. Just a matter of skill and budget. Fortunately, budget is not such an issue with DIY stuff as skill is.
If Tango actually goes under, I am certain that somebody will buy the name and offer reproductions for 2x the original price. There will be folks to pay it too.
Funny how price does so much in this perception-based hobby. At a bargain basement price, an item might not sell very well. At double or triple, it *MUST* be worth the money, and will sell at 6 to 10x the rate. For the same item! No accounting for this sort of market behaviour though....
cheers,
Douglas