[ragnarck]

(Form a HK asshole)
Which of them would you prefer in bass?
XB500 XB700 K450 PX100-II
And now I'm going to buy one of them......
I just emphasize bass the most. 
Note that I also listen a large variety of music, and RPGWizard thinks that XB500 is better than XB700 with EQed.
 

 

[Hydrocharged]

Honestly, I'd look into the IEM department. I bought the XB500 about 2 weeks ago and just sold them, because I was very, very underwhelmed with them. I feel like my old Denon IEM gave me a better bass response than they did. I listen to R&B and a little Hip-Hop.
 
According to what I've read, the XB500 beats all of those mentioned in bass quantity. If you have to buy one of those 4 though, I'd say to go with the XB700.