I've never heard the 2910, but I think you should go with some brand of universal player even if you only plan to use it for audio. I can't argue that these formats may not already be declining, but I'm buying everything I even remotely want. SACD has opened my eyes to a lot of genres I never liked before. DVD-A is a very close second IMHO. Both formats have given me a new love for music & made listening to some classic albums a whole new experience (GBYBR, 461 OCEAN BLVD, DSOTM,). While PLII can be pretty special, I find the results to be about 50/50. My satisfaction with SACD/DVD-A has been more around 95%.
Go test some models if you are able. I have a Yam C-750 universal & it's about half the price of the 2910. Short review (DVD-A 10, CD 10, SACD 8). I also love Denon stuff, I just have a hard time waiting until I have enough money saved up for it.