Nickaraya,
I looked at one of those Isuzus before I got the Super Duty. After reading about them I was impressed, but even more so by the Mitsubishi Fuso version; that is a real nice truck. A friend got the Isuzu, with the smaller diesel engine and he has had issues with it, but that is only one data point.
One of those with the saddle-style toolbox mounted behind the cab would be a sweet rig for smaller and pruning jobs. The 16 yard Internationals are great when the chips are piling up quickly on a large crane takedown, but many days the lower fuel costs, better turning radius, and actually being able to hear your satellite radio would be nice reasons to have a little Isuzu or Mitsibushi Fuso.