Well, for a lightweight alternative, there's Razor-QT, like LXDE, but Qt instead of GTK+. Still, I don't understand why people are so obsessed about running the DE's native apps, it's NOT an all-or-nothing approach! I use KDE but still have LibreOffice, VLC, Chrome and other non-native apps as my default programs. What's the damn problem? I really don't get it. This in-fighting is so ridiculous is isn't even worth typing anymore. And it's exactly because of all this nonsense that Linux cannot easily gain new users, as there is a constant rift between users and developers themselves.