mbiondoThe dac you have is great keep it, and being a ring-dac sounds very good with RedBook pcm cd's or downloads.
If you don't plan to go DSD which I have never heard sound any better than well converted RedBook, stick with what you have and enjoy your collection which I bet is vast.
Use the money if you have itchy feet to upgrade speakers or amp.
I noticed your Delius also has volume and balance ability in it, hope you've tried it direct into the poweramp.
Cheers George