looking at buying headphones for my 360.

there r a few competitors out there such as:

• Tritons ax 360, pros, 720s and 900


• Turtle Beach x4 and x41


• Astro a40 and mix amp

i am completely lost, i dunno which one to buy.
i hear the astro a40s are amazing but they come at a hefty price.
i am willing to pay for them as long as they are the best but could someone
give me any personal reviews if you have used any of the above?