I've been using XMPlay for a few years now because of its ridiculously small file size and system usage and superior sound... but as my library has expanded I'm getting annoying with the bad UI (in particular the library is just a comprehensive playlist, it's not divided up like folders and such). As much as I hate iTunes for a variety of reasons, I like the way the interface works with the library organization and playlists and the like, and genius playlists. Is there any other players that do the same thing as iTunes without the heavy system load or large file sizes?