My favorite quilting item, hands down, is my LA followed closely by my Bernina. I have really low ceilings in my home so a design wall wouldn't work too well for me as most of the quilts I make are queen size. I use my guest bed instead, it isn't perfect but it works and gives me more surface space than my low ceilings would allow with a design wall.
I am envious of your roll up design wall.
I use a peg board to hang all my rulers and tools. The shelf unit is super cute, but in my case, it wouldn't be as functional for me as the peg board. I have one in my LA room as well to hold all my templates, stencils and rulers as well as odds and ends. Do love my pegboards. They aren't near as pretty as your shelf but they are incredibly fuctional and practical.