The Asus Ares III is the king at the moment, they only made 500 of them and right now (you have to have a liquid setup) Amazon USA has 10 only, not sure how many other places have them. It comes in a briefcase and some other Ares III stuff.
The card is basically the R9 295x2 Asus Ref card, then redesigned by Asus from the ground up, tweaked, OCed and then placed nicely in a EKWB custom Ares block.
All people who have tested it say it is one wicked card.
But just give it 1-2 month and something bigger, better and faster will be out as it always happens.