Corsair 750D, it looks simple but it can do alot more then you think from the outside.
the window is big too so you can see all your nice components and LED lights if you choose to have them
the cosmos s/se, looks like a cool case with also great options for fan mounting and LED mounting.
the side window is kinda on the small size though.
cm storm stryker, the color white looks perfect on this case, the thing i like most about this case is the front pannel with the power button and the USB.
if i had to choose i would take the 750D, the side window is pretty big and the front looks like there is nothing there but behind there are 2 more fan's which i really like, and there is alot of space to fill with all kind of components.
i hope my opinions helpe you choose what case you want