I play bass at a church that does not use amps on stage. We have a professional setup with Aviom monitors, etc. I have used onen of Sony's best headphones (7509) and M-Audio XP-30's. The Sony set is not focused enough for the bass and the XP's keep slipping out of my ears after experimenting with all the ear pieces. Please direct me to the very best headphones for on-stage monitoring, and I appeciate a few alternatives if too pricey. Thanks.