If shopping locally instead of on-line, it would be best to bring your thick socks to the store and try on the shoes. Larger size might give you lots of extra length but might not add much width where your thicker socks need it later. I bought a larger pair of shoes (REI scratch and dent sale, had a great price) and got lucky that they fit well with thicker socks but that is not always the case.

If you get a pair that does not fit well with your desired socks, you might find that different insoles can be used to fine tune the fit. I have changed the insoles in several of my bike and hiking shoes/boots to get a better fit.