Hello,
If you want to have a new headphones with good bass, my suggestion is SR80i .
In my opinion, I think SR80i has the much more healthy and better bass than XB700.
To be honest, SONY XB700 owns two much bass, but it is a pity that the bass has already covered the medium and high frequency of the headphones.
My friend has owned SR80i for half a year, this summer I have heard it with some pop music.
It was amazing and before that I have never heard the sound which was so dynamic and attractive.
My English is not so good, so please do not mind...