Frequency response graphs won't help you tell whether you will like the sound of a headphone and are especially meaningless to beginners.
I wouldn't recommend the Ultrasones - fairly uncomfortable, bulky and not especially well made.
Denons are overpriced in Australia, so you'd have to buy them overseas to get decent VFM out of a pair, and even then : bulky.
The SRH940 are a nice headphone, but again large and bulky.
The ESW9 are another nice portable option, as are the Beyer T50p