Buying yet another mp3 player, which one should I get? or portable dvd player?

My first media device was the Ipod Video. I have it completely filled, and decided to get a PSP last christmas, That however is completely filled even though I had 3 gb on it. Then after a couple months of buying that I bought a Zune. I only have about 12 GB left, but it's the best media player I've owned out of these. I have money saved up for another one, but what other companys are left? or should I just get a portable dvd player?