you can also look at
www.737cockpit.com
They have a truly plug and play CDU. You only need to connect USB, no need for extra vga or tv-out since the display is driven by the on board processor. The cdu is fully programmable and can be made compatible with any software
right now its compatible with Project Magenta and PMDG have announced drivers for it too, so it will be compatible with the PMDG 737 and 747 soon.
The 737 cdu is for sale for quite a while now ( i have the 737 myself (and i have one from FDS too) and the 747 cdu will be released soon.
Since it is programmable it could also be made compatible with LevelD.