Now that "Black Gates" are no longer available,

I've had good luck with the Panasonic TS series from Digi-key. I have used them on two different projects and I have been very happy with them. Here is a link. I usually get the ones with the lowest ESR.
http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=131081&k=panasonic%20TS

Mechans they stop production a couple of years ago I believe. Not a big enough market.

Good luck

There's still plenty of options, Jensen, Mundorf, Nichicon FG and Nichicon KZ. I also found BG over rated.

Just want to add to Face's post:
You want the tube cap series from Mundorf, not M-lytics.

Face,

What BG are you referring too? Standard, FX,WKZ, NH?

Thanks.

Roger,

It's been a while since I've used them, I only remember they were one of the premium lines for the signal path. I found them dark and unexciting and only slightly better than the generic electrolytic caps they replaced. They didn't live up to their reputation, IMO. As always, YMMV.