Unfortunately I can't give an unbiased opinion here
The ATH-AD700's were my very first stepping stone into the audiophile realm.
At first, I regretted spending my 170$ AUD on the headphones. Being young, I was expecting the quality I had heard in the audiophile shops (where I tested products that were worth well over 1000$).
But it was my very first headphone and I stuck with them.
After about a month I purchased the ATH-CK100's for roughly 500$ AUD. These sounded roughly the same as my AD700's.
So the story continues where I took my AD700's all over the place - On train rides, in LANS, My desktop etc etc (I can attest to the build quality)
I then managed to get my hands on a pair of HD800's and the coveted LCD-2's (for an extended period of testing).
But funnily enough, I preferred the AD700's over them. I think I just got too attached to my first pair of phones though.
HOWEVER, I must say that the COMFORT, BUILD QUALITY and SOUND QUALITY make the AD700's a much loved pair of cans universally.
I'm assuming that your not too much into the audiophilia market as you are the gaming. But if you were, I would definitely say to go with the AD700's - If only to experience why such a large proportion of head fiers recommend them as entry level headphones.
Also as a side note, I liked the K702's. But I had the AD700's and didn't think the price difference was worth the upgrade. What I'm saying is: A dollar saved is a dollar earned.
If you foresee yourself getting into the audiophile market - BUY THE AD700's
If not.
It's your choice