Sony or Sennheiser?

[Mf1232]

im looking to buy some new IEM's and i love Sony, they've never let me down, but I've heard nothing but good things about Sennheiser also. The are the ones I'm looking at;

Sony Extra Bass
http://www.sonystyle.com/webapp/wcs/...52921665774386

Sony Bud Style (Which I used to have but I broke :P)
these were very nice and had great SQ
http://www.sonystyle.com/webapp/wcs/...52921665194451

Sennheiser CX-300 or CX-400
300
http://www.sennheiserusa.com/newsite...transid=500830
400
http://www.sennheiserusa.com/newsite...transid=500936

just to let you know, i will probably take them dirt biking

please don't suggest any others, I'm trying to decide between these. I want awesome SQ and good noise cancellation as well as them being pretty loud.