I needed a half size up. If you go through Zappos, you can get free shipping on your returns. AT least, this was true when I ordered last year I ordered 2 styles and sent back the ones I didn't want.
Have fun!
They run true-to-size for me. (There was a recent thread about this, and it seemed that it was pretty much equally split as to who took their regular size and who went up a half size. I recommend you either order from someplace, like www.zappos.com or www.shoes.com, that has free shipping and free returns--and get one of each size, sending back what doesn't work---or find a local place where you can try them on).