I'm looking at adding milling large slabs to my part-time milling/woodworking business. Most of the slabs I would mill would be between 28" and 48" but I want to have the ability to do the rare 50" plus slab. Since I need to buy the equipment does anyone have an opinion on whether I should buy 1 Stihl 880 at about $1,800) with a 60" bar or two Stihl 660's at about $1,200 each) and use them on the Granberg 56 inch mill than could run two power heads? Or maybe someone has a better idea. Any input is appreciated.