Private servers are still in development, all the environments and varieties of maps for each dungeon must be done before releasing them.
They are still in progress, just wait.
I've Been Looking the Only servers ive gotten To work is KrazyShanks and pLolz, pLolz is Always Offline and KrazyShanks, Is quite boring, No dungeons all i can do is go to Glands or Spawn Cubes, o2, o3 and not much else.
PLolz has recently found a SetPiece code which may be the way to generating the Random Dungeons that we want. But people still have to make all the SetPieces, convert them all to WMAP and aligning them with a randomizer code. By now there is no downloadable PServer that has prebuilt dungeons.