oh man, sorry about that aura link. just did a quick malolo search and it was white, like the 2010.
ok, first of all, the channel is great for getting the perfect stance width. Apart from that, it doesn't do much. Once you set your stance then you don't use it anymore, so if you're fine on 4x2 then nothing will change.
EST bindings are not worth getting imo. Getting the equivalent binding in reflex will get you 95% of the same feel, def same or better performance AND you are not limited to Burton boards.
I highly recommend this board (and it's a great price)
12-13 2013 K2 SNOWBOARD ULTRA DREAM 161
edit: just looked closer. d'oh it's sold out!
The k2 ultra dream in a 161. Perfect size for you. It's got rockered tips for pow float, yet still rides like a regular board for harder snow. If you're doing backcountry, then you know that it's not always pow, and it's good to have an allmountain board over a pure powder board (the malolo is a good allmountain board too though).