Hey,
I was also fixed at first on getting this rather humble Marantz PM5005 due to the budget constraints. I am looking for a pure stereo setup just to listen to music but then again, as per theory the primary component being the speakers, I shifted more than half my budget towards the (bookshelf) speakers only. It is tempting yes, but in the long run I would suggest to invest in the upper model for the amplifier. This is what I was suggested by Jenny Jose when I enquired about it at Bass n Treble, based in New Delhi. I am in the same situation as you and If I go up a notch I know I'll be having a peace of mind.
Since it is recent query from your side, I suppose you have not come to any conclusion yet. Let me know in case you have found a good combo. I also need the same assistance.