Dali 400mkii or 800mkii?

That's a lot of questions Steve. You might want to break it down into different posts.

The Dalis are excellent speakers but they are designed for music. They might work well for home theater but I really don't know. They have a warm, easy to listen to sound to my ear, if that's any help.

How high up in the bass can you cross over your subs? With 2 13 inch subs you might be better off getting a pair of good monitors. They might be easier to set up and move around depending on the listening situation and could be cheaper. The Dalis are large, heavy and not easy to ship. If you bought a pair and decide they aren't right for you, you have a major job shipping them to someone else.

Dali Makes a monitor, the 300, there's a pair of them for sale on Audiogon now.

Anyway, I would start by finding a speaker you like and then work back along the equipment chain from there. If you get the 300s and like them but decide you want the full range Dalis you can use the 300s for surrounds. Or you may decide you don't like the Dali sound. Then the 300s would probably be less costly to resell.

I hope this helps. I think you'll be better off breaking this project down into smaller pieces. I'd start by getting a set of speakers you like.

If you're really like movies...

Suggest purchasing Dali Helicon 300's--since you have a 56 lb beast of a center
channel. If you purchase the 300's, then you can upgrade to Anthem AVM 50v
or Arcam AV888 as an option.

For two-channel music the 300's will sound great with the 2 fathom f113.
The ribbon tweeter combo really gets the details right with the right amp.

These are really great suggestions. I really appreciate the help. I never thought of doing monitors. I originally was going to stick with axiom m80v3's for my mains but to be perfectly honest I am really drawn to the way the Dali helicon 400's look. I am assuming I will like the way they sound better also but I suppose that is pretty subjective. Either way I will take the monitor thought into consideration.

I auditioned the 400MKII's about a year ago. They struck me as being lovely speakers excelling at reproduction of voices. I thought they would be ideal for opera lovers. Very good with orchestral music, but they did tend to congest at higher volumes. That aspect left me wanting to audition the 800's which I assumed might handle higher volumes better. I did not get to hear the 800's so I can't comment on them. The 400's are visually stunning, and are not demanding with respect to placement. I think they would be pretty good in a home theater set up. I would never buy speakers without an audition, but if that is not possible, I'd say give it a try.