I had a 4-53 in an IH travelall. Things I disliked: Noise (but that is exactly what you LIKED), fuel economy (only got 12-13 mpg). Things I liked: Power and torque.
My boss had a 4-71 in an old work truck and it always sounded a lot more "sedate" than mine (lower rumble, smoother), not sure why.

If you want to go with the aluminum 4-71, I would recommend investing in an Allison 1000 transmission (if you want A/T) or one of the newer 6 or even 7 speed manuals. The DDAD's rev like there's no tomorrow, but they don't like to lug. Right gears will make the whole experience a LOT better.