iPod capacities

Was thinking about getting a new iPod since I dropped the one I have and cracked the screen, but the largest one you can buy is 160Gb which seems a bit rubbish considering my 120Gb one must be at least 3 or 4 years old now. I had a look at the history of iPods and in 2001 when they were first released they had a 5Gb capacity. By 2007 you could get a 160Gb model that's an increase of 32x in the space of 6 years. In the 6 years since then, the capacity has not increased at all. Not sure if I want to shell out £200 for something which has not advanced at all in the past 6 years.