I've had a Meizu M3 since it was released in China, and I so damn happy that I bought it. The quality is really good(same with M6). The sound is great!(same with M6) The battery is good (I get around 15 hours mp3 playing, the M6 will easily get over 20hour playtime!). The player is really customizable, the themes for it are awesome, I never get tired of the GUI. It is very responsive, easy to use, and the player looks amazing (M6 looks amazing too). M3 is like a mini version of the M6, so they are very similar. I really like the touchpad on the M3 and M6.
iPod Nano 3rd gen is a very cool player that I instantly "fell in love" with the first time I saw it. The sound is good and so is the battery. The screen is great, although not as big as the M6 screen, but it's very good to watch movies. The GUI has been improved from the previous nanos, and looks better. The player, is so small and thin that I was like omg the first time I tried it. It feels very good to use. The navigation and controlls are great and a bit better than Meizu's. The downside is that you have to use the crappy iTunes.
If you won't watch movies so much(and only want to watch TV shows, music vids), then I think that you should pick a iPod 3rd gen actually, they are not so expensive, and you get a 1 yeat warranty so you can just get a new one/repair it if it dies, unlike Meizus, which you will get problems with shipping it all the way to china/hk and stuff.
I might get a iPod 3rd gen later, although I will need to sell my Meizu first. I don't know tho, as the Meizu is a great player.
The Creative Zen, has crappy buttons I'd say, and not as nice GUI as iPod or Meizu, but it's not bad at all. I don't know more about the player, so I shouldn't comment it a lot.
I'd say go for a Nano. You can't go worng with a Meizu M6 either.
