akpurohit,
I Seriously doubt on whether your Denon could even push the Sonus Faber Chameleon to sing first.
People could give Opinions but you need to take decisions.
Denon+Dali is not sweet to your years Hence you planned for upgrade. Looking at the Dali , its sure that Denon (low powered) cannot get the Max out of it.
So If you move to Sonus, which is even a higher end, then you might end up in disappointment inspite of upgrading the speakers.
You have good Speakers and nice budget for Amp. NAD,Hegel, Arcam,CA,Matrantz ,musical fidelity,Naim,Peechtree etc are few common brands you could audition before making a decision.
You could wait for audition not wrong, you could travel for audition its not a bid deal than ending up in spending money and no joy finally.
Plan for a weekend visit to Delhi or mumbai, or somewhere You could find Dali dealers and take a audition.
You might end up in spending 10k Max- to feel that you are getting what you what not something like to take whats there.
Else wait for the FM's who are using Dali 7 to comment