As long as you don't have giant feet, any boots that fit you are the 'right' boots for your bindings/board.
Go try on every boot at your local store before you decide on the Ions. Boots are something you really really don't want to get wrong and everyones foot is different. I assume you want pretty stiff boots since you're going with the Ions?
Just went down to my local store who recommended the Imperial over the Ion for my needs. The boot seems less stiff or so im told.
One thing that I do have to make my mind up on is the size difference between a 9.0 and 9.5. Such a hard decision. The 9.5 is more comfortable and the 9.0 is quite tight at the toe end but as I am inexperienced in this area I dont know how much the boots will pack out.