We are really just talking about Hot-End's and not extruders, right?

Because at the risk of stating the obvious: If you are thinking of getting a new extruder, you should first decide if you care about Auto_Bed_Leveling.

I just saw some photo's of an extruder that one of the high end 3D-Printer companies use in their printers.

It was super elegant how they built the Z-Probe right into the extruder. They just use the nozzle as the probe. Right now... After seeing those photographs I wouldn't consider an extruder that didn't have the Auto_Bed_Leveling directly supported.