cwooten,
How far the hoe will reach and quantity of material it will handle are the end factors in selecting hoe size.
The 120 size may satisfy your need. If your going to load trucks with it you might be happier with a larger machine, although on one job some friends of mine loaded trucks with a machine about that size. It worked but it took a while to load each truck and they were pretty darn good hands at it.
I would not want to make a recomendation either way, and would be most concerned about the quality of the unit you purchase.