It is my understanding that the standard Sunrise window uses the same extrusion profile and therefore has the same thickness. The Barrington window has a goofy exterior on the head (top frame section) profile. The Bainbridge is the prettier of the two. Okna also have a very thin profile window line as well.

Those are probably the 3 best at the narrow end of things.

Thank you for the information... the Sunrise contractor was recommended to me by a friend, so I am most comfortable going with that window. I am a little concerned about the frame not being reinforced (as in the Restorations/Vanguard models), but hopefully it will not be an issue with my window sizes. I think the contractor said it was an option though?