I was at Grizzly in Muncy, PA last weekend and looked over the various benchtop mills. I had planned to buy one but unfortunately or perhaps fortunately Grizzly was completely out of stock on every mill/drill it seemed. Originally I had been considering a G0704 with the dovetail column but seeing the size difference for equal price made me wonder if I wouldn't be far better off with the much more hefty (size wise) G0705. What are the practical benefits of the dovetail vs. round column mill drills? What are the practical benefits of a gear drive vs. a belt drive? I really would appreciate any guidance in terms of pros and cons of the various machines.