If you are well versed with Marantz, then stick with it. If you want a different presentation which most also feel as a substantial jump from Marantz then look at Naim. No other CDP's are worth considering, except for Denon higher series which again you might like or not, so audition will be best way to go. BTW, are you planning to bring from abroad? If, yes then pls do demo all of the options for getting best understanding of the sonics of each. Which will go best with your speakers, ideally can only be answered in your room!