Well, if your are going to be EXCLUSIVELY using this laptop AS a desktop.....you should get a desktop.
But if you intend on using it for its portability features (take it with you to work or wherever) then a laptop that is considered a desktop-replacement, is the way to go.
I understand the price might have been lower, but did you compare EVERY SINGLE SPEC?
The video chip/card is where alot of the price difference is found.
Apples to Apples.......laptops are okay, but you cant UPGRADE them in anyway. You cant change their video card, you cant change CPU, you cant change power supply, you cant change the Mobo, or the fans.
You can only (sometimes) upgrade RAM and the hard drive.
Laptops are just not as future proof.
But i think we can get the monitors to display how you want using this laptop.
We can turn off the internal display, so you ONLY use the external displays.....and THEN we can shift the main display to the external, and then Extend to a second or third monitor.