When I went to get my boots they told me Vans came up a bit wider so wouldn't suit my narrow feet. However when I tried them on they fit as well as the Burton, Nike and Salomon boots they were trying to sell me. Eventually got Burtons as the Vans were a little soft for what I need currently, but I am over 50 lbs heavier than you.
Key thing go get them fitted and chose comfort over style first. Theres plenty of shops in the Milton Keynes complex that will size you up and help with fit.