I have small feet, dun really know. From what I see size 12 is the cut off. Is that your regular shoe size? 11.5. People may usually tell you to go try out every boot they have at your local snowboard shop, they should be snug, and you may actually half size down, so potential size 11. I say you can go either or, wide or not; but I'm not too sure.
Shop for last year's gear, 50% off. Atomic Hatchet's a valued board, good bang for the buck, range $160-230. Capita Stairmaster or Scaremaster? See if you can pick up last years K2 Darkstar or Believer, or Rome Agent or Slash for half off.
Look around sierrasnowboards.com , dogfunk.com , backcountry.com , the-house.com ; if you see something you like on sale, your size, look it up, do some research on it. Good luck, happy new years.