i hate to say this, but i think you're going to be underwhelmed
it's always fun to add some new gear, and i am actually a fan of atmos in theory. but beyond some 30sec demos, i can't say that atmos has added anything to the enjoyment of movies for me. I'm limited right now to 7ch, and i will 100% choose 7.1 over 5.1.2 every day. I've been eyeing up 'affordable' receivers that would allow me to run the full 7.1.4(already have the speakers installed) but it seems like there is ALWAYS a better way to spend a thousand bux, haha.
bottom line, if you love the hobby, and enjoy the journey, continue and enjoy yourself. That's what will make this worthwhile. If, on the other hand, you are wanting a fair performance return on the effort and money spent, i don't think this is the way to go. FWIW, the best i've seen from marantz was the 6012 for $829(b-stock from gibby's), the cheapest possible 11ch(with preouts) i've seen has been around $630 (now out of stock onkyo rz830.
really odd question, you don't happen to live in calgary, originally from winnipeg? Because you have the same name as my cousin, haha
Displays: Samsung PN64F8500/JVC X35
AVR: Pioneer VSX-1130K, 7.1/5.1.2 audio
Sources: HTPC, PS3, XBOX360, Wii
Control: Harmony One