I have had the Diva 3032W for about 8 months. I love the thing. It is the size of an older pager runs on 1 AA battery (I get about 8 hours on a 1800 mh rechargable)
display is pretty basic and navigation is just stepping through songs. It is fairly well made and will take at least 1 gig compact flash cards or IBM microdrives.
It has played all the music mps iI have thrown at it flawlessly. Old time radio shows recorde at 32 mono choked. Plug it into a win 2000 or xp machine and it is recognised as a removable hard drive. The headphones that came with it were loud but crappy sound and the physicaly hurt my ears. Yop can get them with built in memory of 0 to 128 meg. I got the 32 meg one and there are a couple of places that sell it for $70 plus shipping. There is a guy that sells them on ebay and you can get it for $60 from him.
Diva link 1
Diva link 2