I'm looking to purchase an articulating keyboard tray for my desk at work. The current setup (non-tray) has me currently on the road to Carpal Tunnel so my work is going to help pay for it. My price range is $100-$150. Anybody have a tray to recommend. I use the mouse alot but am seriously considering switching to a track ball due to the frequency that i use the mouse. Any help would be appreciated. I don't even know where to begin when it comes to looking for one of these.