I have the CAP-W. I suggested the liner due to the vision issue. The liner has very little pad at the top (maybe 1/4in. or less) and snugs up the sides and back to your head, allowing for a tighter fit and some side-to-side movement without the use of a chinstrap. The liner also leaves plenty of room for my fans and other electronics. This is the one I have: http://www.motorcycle-superstore.com/2/6/193/46987/ITEM/HJC-CLX-5-Helmet-Liner.aspx?WT.ac=RichAutoC.omplete
My avatar is me in full armor if you want reference the size of the CAP-W. As you can see, I have a relatively short neck and my cheek tubes ride very close to my chestplate. I have some side movement, but I cannot look down.