Is the Leben CS600x unbeatable?

Any piece of gear is “unbeatable” right up until something you hear better comes along. 

Terms like best sound or best integrated are always relative in the context of the system, the room, and of course the budget. 

What works magic in one setup may fall flat in another. Context is everything in this hobby. 

My point is, if you have the Leben but have the resources to upgrade…what’s the upgrade?

Wavac! But admittedly Leben is pretty far up there.

Depends on how much money you have to spend. I think you need to do some auditioning. Don't rely on ads or faith. There are many fine integrated amps out there. The LEBEN does have a good reputation but rather limited sales, in order to get much reviewer and customer feedback. Especially if you are buying on faith.

In the tube-based category I would take a strong look at PRIMA LUNA. Especially when it comes to price vs, build quality, vs. circuitry sophistication and true musical performance. Check it out and you will see what I am talking about. Also, the flexibility is unbeatable.

I would love to run the O/96 with my Decware Mini Torii.  Heard the speakers at Aural Audio in Denver, not sure what was driving it but damn :)