With a size 12 boot I think you'll regret getting a wide board down the line. Just to give you an idea... I'm a size 12 and I ride a 150 (Rome artifact) without any drag or problems. There's not much reason for that extra width unless your really up in the size 13+ range.
With that being said I have a basically new skate banana (built to shred anything, from gnarly ice to fresh pow) size 156 with brand new union force bindings... Size xl.
Bananas are great boards for anyone, you can really take it anywhere on the mtn and have a sick time. Even though it's known to destroy the park (which it does) it can hold up perfectly anywhere else.
If youre interested pm or email me
It won't be the cheapest deal but trust me you'll be glad u did it.