These are my top four favourite Swedish black metal releases, although IMO you really can't go wrong with pretty much every album Dark Funeral or Watain have released.
For me it is without a doubt these three albums. Quo Vadis: Day Into Night is an underappreciated tech death masterpiece in the vein of Decrepit Birth's last few albums. None So Vile is a brilliant album, but I have a soft spot for Blasphemy Made Flesh as it is the first Cryptopsy album I ever heard.
During my CD/tape trading days in the late '90's these were the first two USBM albums that I was exposed to. To this day they are still two of my all time favourite American black metal albums.
Mine is without a doubt Devourment's Molesting The Decapitated.