There we go ... Dont know the Audio Technicas but I sometimes use my 595 (sennheisers). I spent about three weeks deciding til I finally purchased them and a headphone amp only to find I hardly ever use 'em. Unless you are really into headphones (is anyone?) I'd say dont spend more than you have in mind. I'm sure they are as good as most others at the price.
Do you mean the ANC7 noise-cancellers? If so, they're a strong four-star product. AT's range is a mixed bag, but there are some increasingly good options on there.