I need a rotary hammer for chiseling tile & glued floor laminate. I don't care about the rotary drilling feature as I have a small drill that is also a rotary drill hammer for drilling into concrete but it doesn't chisel. My sister has a small section, 1'x2', of glued wood laminate on concrete, that I walked away from with a hammer & chisel, that needs to be removed. She's going to pay me for the tool, I will supply the labor, I keep the tool. Looking on CL in my price range, I saw 4 tools that interested me. All are drill, hammer drill, and hammer chisel. A little used cordless 18v Makita with battery for $75 but no charger which I already own. New there's a corded 1 1/8" Hitachi & Milwaukee for $250, 1 1/8" Bosch for $200, 1" Bosch for $150. All are SDS+. I know nothing about the difference between 1" & 1 1/8" and the long term prospects of the 1" becoming obsolete. I will always have electricity. Suggestions please.