a Wide Gamut Coverage of Adobe RGB: 95% is not cheap and you may need to revise the budget or the specification.
Color Gamut is the monitors ability to replicate the RGB color sent from the graphics card to the monitor. e.g. the BenQ E2200HDA monitor is listed to Adobe RGB 72% and my Flexscan S2231 is Adobe RGB: 95%.
So 23% of the colours in the High end spectrum will just look the same on the BenQ Monitor. And since you want to retouch photos inside Photoshop I think you should consider the Gamut above everything else. click here for a techie explanation or google 'Wide Gamut display'