At the end of the day, non of those sounds could've come from Alec Guinness, so the original is best. I don't question how he made the sound.

In a universe of lightsabers, space ships the size of moons, and the force, a man making a noise like that is possible through a device or the force.

The sound on the Blu Ray, in my opinion, further proves that George Lucas wants to screw with us. It's almost like he's cramming in shit, because he knows it will rattle our cage, and the fanboys will lap it up like a kitten on a tit.