I dont know whats the best..Last year I bought a used G1140 off of Craigslist. I wanted a GO512 but could not find a "good deal" on a used one. I recently installed a pattern Sander conversion on the motor end. I have a small shop and used a 6"x 48" verticle sander for 3 years and then bought the Rigid combo belt/spindle sander, the Rigid is very handy and light weight. I have not used the Rigid spindle sander since I already had a 6 inch Jet oscillating spindle Sander. For grinding limbs I first use a 50 grit belt and get close to the line then switch to a 120 grit belt to sand to the line. I used a carbide blade once, I just didn't feel safe doing it that way.