I own a PJB100 with a 60gig drive. It's great and has worked flawlessly. Unfortunately, it's no longer available. I bought it based on a recommendation from Headroom--these guys do headphones and headphone amps. Great site for road warriors that love music. They recommend current MP3 players, and the iRiver is one of them.
Headroom MP3 recommendations
Headroom MP3 recommendations