I personally own a set of the Callaway Diablo Edge Irons and love them, I've only just stared playing myself so I certainly do not have the same level of experience of the other posters here however I would recommend them. I personally tried around 6 different brands of irons ranging from Dunlop's through to Taylor Made and found the Diablo's to be the most suitable for me, while the Taylor Made's looked and felt incredible I have to say I hit better shots during my testing swings with the Diablo's and that's what mattered to me.
I'm pretty sure that others will be able to make some better recommendations although I think they would need a little more information such as your handicap, usual faults etc.
If it helps the advice I was given was to buy a decent set of Irons and build your Bag piece by piece, that way you can ensure that all your clubs suit you and they are of a decent standard.
Hope you enjoy them