Can't help you with the wireless cans, but have a look at the What Hifi reviews and Amazon reader reviews.
As for the AKG K702s, they are very comfortable and they need a lot of running in. I have had mine for 6 months now and they have 100s of hours on them and the sound now is different from when I fist got them. The clarity, soundstage and bass have all improved. They are easy to drive and if you are an occasional headphone listener your NAD will be fine, but a dedicated amp will show them to their full potential.