It's certainly not the smallest unit we've seen, but the RD2840 is a decent hard drive player.
The Lyra RD1080 is the best of RCA's current crop of flash-based MP3 players.
Although it's packed with useful, fitness-oriented features, the RCA Lyra RD2212 is disappointing overall, thanks to a flawed design.
As a basic, inexpensive digital music player for the gym, the Iomega Mixx is a decent choice, but beware of the poor battery life.
If you need an affordable medium-capacity subscription-ready player with no extra features, then the RCA H100 series looks like a safe bet.