Have to disagree with you on a couple of things here. Firstly, the DG2813s that you can get from places like cousins are not always the same as what is in our reps. Specifically the height of the hands is much lower, and on a PO it is hard to get the hands to clear the hour markers without bending them up slightly. Ajoesmith sells the proper movement, with the correct handstacks for about $40. As to the 28k movement being more accurate, it is not. The genuine PO beats at 25,200 bpm, so it is slightly smoother than a 21k, and slightly rougher than a 28k. If you look at a gen you will immediately notice that it is not as smooth as a 28k movement. IMO, a 21k looks slightly more accurate.