I have to say that I am hard pressed to remember any thing named Marantz that I didn't like. I use a Pioneer Elite SC-61 in my office and the spec sheets are almost identical, as far as what you listed anyway. I'm positive the Marantz has better technical specs than my Pioneer, you know THD, SN Ratio and so on. So if I had to chose I would pick the Marantz but I would also have spent a lot more than I did (less than $800 brand new online).... I hope I helped you out at least a little bit, these things are tricky so ultimately you'll have to decide for yourself.
Andrew
Synesthesia Studios
Andrew
Synesthesia Studios