I don't think the stock CX-5 would be in the same league as the APL or the Theta though. Tvad could answer that question regarding the APL I think.Regarding Ayre C-5Xe vs. APL Denon 3910? I'm afraid I can't as haven't heard the Ayre in my system.
Jp1208 (Answers)
The APL Denon 3910 is the best digital I have ever heard in my home. The Exemplar Denon 3910 is excellent (I own one now), as is the Modwright 999ES. The Exemplar is more balanced top to bottom than the Modwright, but it's really a matter of personal preference. The Modwright Denon 3910 has just received an excellent review on Enjoythemusic's Superior Audio website.

