Looks like you are heading in a good direction. The Define S2 will be more pleasant to build in. Are you going to stick with 240+360mm Radiators or run dual 360s? Never heard of the fans you mentioned, and most cheap RGB fans aren't that great. More rad surface means you can run the fans at a lower RPM and keep everything nice and quiet.
I just picked up that same B-die kit. The little red plastic pieces can be popped off easily. I think it looks neat without that.