hi there iam upgrading my hifi, iam using marantz mcr510 melody stream at the minute, my speakers are monitor audio bx2, iam just about to buy the pioneer n50a network player, my question is i have been looking at a stereo amp marantz pm7005 or the pm6005, has anyone have any of these amps, would buying the pm7005 over the pm6005 make a big difference, this will be my first proper seperate system so any help would be great