Go for the glass bed attach it to the existing bed with document clips . You will have to move the Z axis end stop switch to allow for the extra bed thickness. I have been using glass bed on both my machines for 2 years no problems but I also have sheet of 1mm Tufnol (Garalite) clamped on top of the glass with the same clips. Works every time for PLA Nylon ABS needs ABS GLUE to work every time.