There is basically one Atmos speaker from Klipsch though it is bought as a pair or in the tower speakers. I shop on Sound Distributors for my speakers and it's a whole lot cheaper than Best Buy.
My advice is to focus on some great Lt & Rt mains, a great center channel, two 12+ subs, and surround speakers...then worry about Atmos.
Start at the base and work up from there. The Denon mentioned will be a good choice. It will do more than you need. Don't use it's processing to upscale anything, rather run the signal straight through. The Visio is an all around safe TV. If you go the way of a projector make sure you get a good one. They ain't cheap. Then you have to mount it and get a good screen. With out knowing your budget it's a bit harder to make suggestions.
Reminder: for me sound is 50% of the experience. Keep posting and let us know where your at.
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