40" is the new 27". Make sure you have a good desktop manager. Recommendations are welcome. http://www.amazon.com/Philips-BDM40..._cp_147_4?ie=UTF8&refRID=009GAKXK4JXZQZT6XVFZ
An additional feature for Traders that may not require a Desktop Manager: Rotate Your Screen and Partition Desktops with the Display Pilot Software Auto Pivot detects the rotation of the monitor and dynamically rotates displayed content automatically. All windows will be equally proportioned and displayed on the screen when clicking on the Desktop Partition icon. This allows you to compare designs with just one simple click. Moreover, you can preset different picture modes for each frequently used application. Display Pilot will automatically switch to your preferred viewing mode.
Seems to be the top choice for a 40". http://www.amazon.com/dp/B00VA2X5EU...UTF8&colid=WAF31G2V9CD4&coliid=I17M69ZBLTPVMY
Don't go that mad with all that high resolutions really. All you need can be really done from that simple 1920*1080 p Full HD and that's really it. Your eyes may be hurted much more honestly if you will be using some very high resolutions monitors.