Now available for under $100—$400 less than the Polk Audio I-Sonic ES2—Jensen has released the second HD Radio-equipped speaker dock for iPod. The JiMS-525 Docking Digital HD Radio System for iPod combines a top-mounted iPod dock with AM/FM/HD Radio tuning, stereo speakers, an LCD display, dual alarm clocks, and a remote control. Though it carries a suggested retail price of $160, the JiMS-525 is surprisingly already available…