Hi. I am looking for a cd player to partner with my Onkyo 606. Currently I am only using a DVD player (Cambridge Audio DVD57) but mind you, this dvd player is very musical indeed. However, if I upgrade to the Marantz cd-5003 which is now only £150, will I hear a much improved performance? Moreover, will a cd player sound great if I only partner it with an av receiver and not the dedicated 2 channel amplifier? Thanks again.