If you are looking for one of the most gorgeous LCD's for a slim arcade cabinet, I have a spare Acer AL2723W for sale. It is comparable to the DELL Ultrasharp 2709 since it uses the same Samsung panel.
Specs:
PVA 1920x1200 27 inch display with huge static contrast (no crappy TN)
Even larger than the 27 inch iMac since this one is 16:10.
Wide gamut (capable of more saturated colours than an iMac for example)
178/178 viewing angles so suitable for vertical and horizontal mount
HDMI, DVI and VGA input
Very well suited to mount in a cab (it is the top BTO option for displays in my Retro Space cabs). You can pop-off the plastic case, and then you have a perfect "embedding" display with nice flat slim frame metal case (all ports are in the metal case, so no loose power section or something like that), and separate PCB with controls for easy access from the back. Built in speakers and amplifier are detachable and remountable too.
100x100mm VESA mount

It is new in a original box, I only checked if it worked, with 22 months European warranty remaining. They used to cost 800 euro's, this one is for sale at 450 euro. Only shipping in the EU.