Apple iPod Nano and Cingular Rocker

I've got a single media player with a 20 gig harddrive (it's not an iPod). But I plan to have three by years end; a 60 gig unit to hold all of my media (audio and video), the 20 gig I already have (which is smaller is significantly more portable and does audio and video) and then a smaller player with flash memory. The flash player would be for use during physical activities, the larger one to carry my all my stuff, and the 20 gig is the middle ground.