Everything USB reviews the iRiver Clix 2 with 4GB.

Quote from the review:
"Flash based MP3 players have always had some of the worse hurdles to jump when it comes to setting new market trends. Despite everyone's collective efforts, every MP3 player has been burdened with capacity, battery, interface, video, or software integration issues that simply marred the overall experience when compared to the market leader. Well, it was bound to happen sometime, but one company finally caught up to and surpassed the competition. Meet the 2nd generation iriver clix, quite possibly the best flash MP3 player that money can buy. Read on as our in-depth review explains why."
Read the full review on Everything USB.