Best Cognac

Normandier-Mercier is too sweet. I simply do not believe that it is unmixed Cognac. Delamain Vesper is a bit dry and has too much fire. However Delamain Tres Venerable is great (don't expect sweet nectar) it is not, it is a "real thing" with no 'sugar' added. On the cheaper side of non-sweet Cognacs is Marquis de Gensac.
These are not truths just opinions.

Back in the days in Europe when I was still drinking Cognac I used to like Camus (both the writer and the Cognac).

Just sampled Pierre Fernand reserve. This stuff, for $60 / bottle (or less) is insanely good. It falls between a VSOP and legitimate XO but IMO closer to the latter.

I agree with Inna re. Armenian Cognac (ok, brandy) however it seems like on the east coast all we have is the low grade stuff. I brought a couple of bottles of Urartu from my trip to LA and haven't been the same since I ran out.

Enjoying a bottle of Paul Beau Hors D'Age Grande Champagne a roughly 30 year old singe estate cognac i picked up online for about $130 serious stuff for the $$. I also love Armagnac and can't recommend enough the brandy's from Chatea de Busca, their Hors D'Age 15 year for $90ish is a real steal. And to the poster who called Normandin-Mercier sweet I must disagree. Compared to Delamain most Cognac may come across a touch less dry but Normandin-Mercier is unadulterated and fantastic stuff.

Taste is a very personal thing , I just do not like overly sweet drinks, N.M. Ferrand and that Armenian brandy are certainly in the category of sweet drinks. You interested in extremely complex Cognac ? Give Audry Memorial a try, you will not be able to drink anything sugary ever again.