I would go with the 10x. The 12x are a beast to hold steady without a tripod. I even like a tripod for the 10x. Like Joe said, you won't be disappointed.
I actually just got the 12x's and would recommend them. TO me the 12's were no harder to hold than the 10's. I am much more happy with the 12's. I will be buying some sort of a little tripd though for longer stationary glassing.
If its not to late my 2cents would be for the 12's but depends on the country you hunt I almost always use a tripod. Good thing with cabelas is you can change your mind.