A friend of mine is looking for a non-iPod MP3 player. Are there any trusted review sites for these products?

Also, should I point him toward anything else besides Creative and iRiver (which he already knew)? He needs 20-30 gig, more rich UI than iPod, but no need for photo and video. Thanks.
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FireFox31
110gig MKIIa (30+80), Eutronix lights, 32 meg stacked RAM, Filener orange gel lens, Greenlights Lit Buttons green set