Triple Display issue Mac Pro 4.1, GTX660, GT120.

Hi guys.
I have a mac pro 4.1 with a GTX 660 and a stock GT 120.
The 660 has 2 x DVI, 1x HDMI, 1x Displayport
The GT 120 has 1x MiniDp 1x DVI.
I have both NVIDIA drivers and stock drivers.
I've recently received a Dell U3011 2560 x 1600 to compliment my 2 20 inch 1600 x 1200 monitors.
I plan to have the 20's flank the u3011 in portrait on either side to create a PLP setup.
The problem is that I can't get them all to work together.
Most of the time the monitor on the left isn't recognised (in system information it is described as color LCD display) and displays a resolution of 480 x 640. The other two monitors will work fine.
If I fiddle with the video outputs on 660 and 120 (mix them up, use adapters etc) I can get all three monitors to display their correct resolution, But if the computer sleeps or is restarted it goes back to low resolution on one monitor and doesn't display an image at all and goes to sleep.
The U3011 is always recognised at its correct resolution via displayport.
Other two are connected to DVI1 on the 660 and the DVI on GT120
Currently both 20's are recognised as 'vga display' or 'color LCD', no resolution options are available, just what it defaults to (640 x 480)
What it is at the moment:
What it was before I had the 30 and was using a 24:
I'm pretty sure its not a monitor issue, as the issues vary between monitors (depending on which is plugged in where)
I'd prefer to resolve this issue by running everything off the 660, allowing me to remove the GT120.
Any help would be much appreciated.
Cheers.

I'm pretty sure its not a monitor issue, as the issues vary between monitors
I'm pretty sure this is a display and adapter and interface problem, especially when the name(s) of your display(s) show up wrong after sleep.
The Mac uses one display driver that is highly parameterized. The parameters to be used are set by sending a query to the display for its name and capabilities. This query is sent on the secondary digital data channel, and is sometimes referred to as EDID data.
Currently both 20's are recognised as 'vga display' or 'color LCD', no resolution options are available, just what it defaults to (640 x 480)
When the name of the display is not correctly reflected in the name of its Display Preferences pane, that is a direct indication the display-adapter-cable-display part of the chain "dropped the ball" in resounding to the Mac's query for capabilities.
Adapters that do not pass the EDID data through, and displays that do not answer when queried for their name and capabilities are the primary source of problems. For example, TV sets that are not "paying attention" to the secondary data channel, and therefore do not answer the query, drive Mac users crazy.
The query is sent in response to four different events:
• System Startup
• wake form sleep
• cable insertion at the Mac-end (not necessarily at the Display-end)
• The use of the Option-Detect_Displays button in Displays Preferences window

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