One size fits all. Store up to 30,000 songs, up to 25,000 iPod viewable photos and up to 150 hours of video. Up to 36 hours of music playback and up to 6 hours of video playback. 2.5in (diagonal) color LCD with LED backlight. AAC (16 to 320 Kbps), Protected AAC (from iTunes Store), MP3 (16 to 320 Kbps), MP3 VBR, Audible (formats 2, 3, and 4), Apple Lossless, WAV, and AIFF. Syncs iPod-viewable photos in JPEG, BMP, GIF, TIFF, PSD (Mac only), and PNG formats. Silver or black.
Full price £179.00 - £30 off voucher + £3.95 Delivery = £149.13 plus you can get 8% qidco bringing the price down to £137.52 (i assume you do not get quidco for the delivery charge)
This is the cheapest I have seen. Note the £30 off code "ZG430" is for new customers, register a friend if you have used them before.