Sorry, I read your post wrong. I thought you were asking about a new amp and that your friend was lending you a CD player. After reading your post again, I have no idea how I came up with that in the first place.
Of the players you list, I would choose the Marantz. Some other players I've had on my 2's that sounded very good and are in your price range are - Rotel 1072, Arcam 33, Ayre 7. As far as the iPod goes, I can't imagine it sounding better than any of the CD players listed here. Your speakers definitely have the resolution to easily pick out any differences between them.
Of the players you list, I would choose the Marantz. Some other players I've had on my 2's that sounded very good and are in your price range are - Rotel 1072, Arcam 33, Ayre 7. As far as the iPod goes, I can't imagine it sounding better than any of the CD players listed here. Your speakers definitely have the resolution to easily pick out any differences between them.