Replaced stock window with .22" thick clear acrylic as I didn't care for the stock fan cutouts for the Video Card. I think this looks a little cleaner. Used the stock fan mounting screws from the case and some custom 3D printed parts to retain the new window. Using mostly for web browsing and photo editing. Have a few games installed and the graphics card performs great.
2014-04-20 update: Added a few pictures of the custom window on the side panel. Also added pictures of one of the 12 screw mounts I made to secure the new window to the side panel.