I need advice on upgrading my DVD player


I currently use A Denon 3910 in my HT 7.2 setup, Mac mc207 amp, anthem avm30, paradigm sig4 & C3 for the fronts. I am trying to decide if I can further improve the sound (movies mostly but some CD's and SACD's) with a player upgrade. Currently i want to stay out of the blue ray game. I am considering a Denon 5910, Mac MVP 871, Arcam DV139, Esoteric. . . Or is the Denon 3910 close enough to its bigger brother or the others to not warrant the expense??
docrobbi
Thanks Michael for your comments.

I use the Denon in both analog pass through ( for SACD and CD's) and digital to my prepro for movies. I think it falls a bit short for music. I don't want to add another component to the system and am looking for a universal player replacement that could get me improved music playback. I guess my question is "do the above listed alternatives offer significantly improved sonics?
What happens when you use the pre/pro and digital connection for CD's? Do you find that it suits your tastes any better or worse?

What do you feel is deficient in the sound that you're currently getting through the Denon?

Michael
I prefer to pass my audio through for music. The dac's in the avm 30 are ok but i prefer to use the 6 channel analog input, it sounds to me better. The player is just lacking something. I just want more detail and a natural sound. I have an NAD m15 cd/sacd player in my upstairs 2 channel system that sounds so much better (of course it is a dedicated CD player and not a dvd player).
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May be worth considering picking up one of the new Lexicon RT-20s that are being sold around here for $1000 or so.

Anyone have thoughts on how the Lexicon compares to the Denon 5910?