Great feedback so far, thank you all so much!
Attached is a very crude layout I made to give you an idea of the size of the room and the way its arranged. The furniture and things are obviously not to scale and the room is a little more open than portrayed in this image, hence the "crude". Not listed were that the ceiling is 9ft. high.
We enjoy movies of all types, especially action/adventure. Average volume level is 40%. And this system is VERY rarely used for music.
Based on the advice given thus far I'm leaning toward a Martin Logan Dynamo 1000 subwoofer first. Then later I will be getting a pair of Martin Logan Motion 40 towers and a Denon AVR-X4100. I have chose these brands because I am able to get a discount on them, so please don't criticize these brand choices. However I am very open to any other suggestions within these brands that may fit my needs better than what I've listed. I mainly just chose the above because it fits within the total end budget for upgrading...for now. The current $2,000 is just a starting point.