^ I have size 11 forces with the force-field inserts for creasing.. The 11's were cutting my circulation off for about a day walking around the house because my feet are a little wider at the tip. Fortunately for me though, after wearing them for about 12+ hours around the house over the span of a few days, they fit absolutely perfectly with no pressure points, no circulation problems, they're light as a feather, and honestly- probably lighter then my Force1's ... I'm a 10.5 regularly in street, but I wanted to get the inserts for my Airforces so they didn't crease so I went with the 11... I could probably have gotten the 10.5's and had them heat molded, but the 11's fit my foot perfectly so I have no complaints..
All in all, if I were you, I'd probably go your size or a .5 up (Your size if you have more narrow feet).
The fit on them is insane nonetheless, and you WILL NOT be dissappoonted