I've been having back pain with my road bike and have tried adjustments ad nauseum. It looks like the old body has just given up after years of reckless abuse. I've been thinking of ditching the drop bars and trying one of the newer "flatbar road bikes". I know I lose some aero-ness but I'm more interested in fitness than quickness anyway. Does anyone have any experience or thoughts between: The Specialized Sirrus series, the Trek 77-7500 FX, or the Kona Dr. Dew??