Thanks for all the help guys. Got the 2713H and it is fantastic. Some info that I gathered on the way:
Dell naming strategy
First 2 digits is size of monitor
Second 2 digits is year of introduction
H stands for wide screen
M stands for the lower end monitors
The M monitors have no aRGB colour gamut, while the non M like the 2410 has the aRGB. Effective colours of the M series are 16 million versus 1 billion for the non M series.
The aRGB is of value for people whose entire work flow is in aRGB.
The 24 series are not widescreen I think and that is why there is no H only 2413/2410 [wide colour gamut] and the 2412M [lower end version] etc. The 27 is widescreen so you get 2713H and 2713HM. The HM is the lower end version.