I'm looking for a new mouse. i've been using a Logitech MX Laser cordless for a while now. I'm fed up with the cursor jumping around. I have one at home and one at my office and both of them suck. Only reason I have not replaced them is because of the programmable buttons. So, I'm looking for the best mouse for autocad architecture with at least 7 programmable buttons. Corded or Cordless, doesn't matter, as long as it tracks smooth enough. On screen accuracy in autocad is important! I'm so far considering the Logitech MX518 or Razor Pro V1.6. Any others you guys can think of? Thanks!