In reply to danm:
Agree with danm's comments, especially re fit.
If you want to go B2, you could do a lot worse than the La Sportiva Trango Cube. I got these 3 years ago to replace my summer leather boots on the basis that their seams are covered in plastic, making them more waterproof for our lovely Scottish climate. (Ironically, they're designed for summer Alpinism!) Three years and many Munros later, they're still going strong - and dry. Very lightweight, climb well and will take a C2 crampon. I've used them in winter and my feet don't get cold, though I wouldn't want to do belay duty with them on. They'd be fine for winter walking so long as you had a reasonably thick pair of socks on. Available in half sizes by mail order. But if they don't fit, don't get them.