I think the difference between the AD16X and the HD192s is substantial, so I would recommend going that route before you throw in the towel and get a Studer.
But, the AD16X doesn't sound like tape, only tape does.
Once you learn what tape is doing to your signal when its recorded, its possible to emulate some of these characteristics in the digital realm or with various hardware processors (HEDD, Fatso).
Also, although there are many advantages to digital editing, this can be a trap that tape saves you from ever entering into.
But I think everyone have to agree, nothing sounds exactly like tape running through a fat Neve or API with a bunch of tasty outboard.
Remember, the stone age didn't end because people ran out of stone.