Anything else I should shortlist? When you start digging there are quite a few players, but I'd rather just go straight for one that will do everything I need. Which is to say, allow me to playback albums in either AAC, MP3 or FLAC (depending on what I've got - mostly FLAC), show artwork, and allow me to put music on the iPhone without having to do it using iTunes or whatever they're calling it nowadays.
(As an alternative, since it's been ages since I last looked into this, is there any merit in any Apple-provided music player, and how can I get my existing music (formats as above) onto the phone without using iTunes or its current variant? Ideally I'd just drop a chunk of my existing audio library (99% FLAC) onto the phone somehow.)