I am looking at replacing the clock in a Phillips CDpro2 with an outboard one. There are several on the market from Tentlabs, Akustic Perfekt and others. How much differenc does this actually make. I am looking at $500 for the mods and have no way to hear the difference before spending the bucks. I do not mind the expense if the improvement in SQ is significant. Anyone have any experience in this areas, especially with the Tentlabs CDPro 2 mods. Thanks