Ipod are totally over-rated I recon. In terms of value for money, their shit IMO.
Also 15 Gb, 20 Gb, 40 Gb ... who ever needs 40 Gb of storage space on a portable music player? Thats about 11,000 songs. About 27 days of continuous music...
I just got a 128 Mb player off ebay,,, £15! + P&P = £24.
But i think 256 Mb or 512 Mb would be better really if your gonna use it a lot.
steve