What about a business phone that can connect you to your trade desk in one click and has a decent mic and speakers?
When i see these walls of monitors, in general connected to multiple PC's, i always say to myself: these guys must have very lousy tradingsystems if they need so many screen to make a living as a trader. Comparable to the guy that buys a 3-5000$ bike and has to force himself to keep up with his fellows when they make a ride in the weekend. Good material is necessary, but can never compensate for lack of knowledge. 1 PC with 2 monitor will do for most of the traders.