2 or 3 monitor challenge

Hi Guys
I have been given permission (!!) to use an area in my spare bedroom to improve my current flight sim setup. It is nicely set up as an alcove at 6ft across and 6 ft deep.

I don't have the money to build a full home cockpit but i would like a large screen setup. Therefore my question is this?

1) Do i buy 2 large screens if so what ones?
2) Or 3 screens and again if so what ones?

3) something else? Does anyone have any suggestions?

Also i have a geoforce GTX 660 TI. i obviously will need to change if i upgrade to 3 screens but will this be ok for 2?

any help greatly received

Daz