Try to listen to the beats within the beats. I had your same problem, until I noticed all of the small, low beats that are in between the bigger, louder beats and "static". You'll stop having other ideas pop into your head, because your mind is concentrated on finding beats within the beat...

I recently got the Sennheiser HD 555 Headphones for Christmas to use for Halo 3 tournaments. However, I remember seeing I-Doser recommending Sennheiser headphones. So, I was wondering if these headphones would be good to listen to doses with?