Hi. Im buing a ipod touch probably in the near future. Primarily for use as a portable calendar and for the nike+ thing. Also as portable internet device. However i would also very much like to use it for playing music obviously. And atm i have a phone for that, with a 4gb sd card. The question is would i have more or less than 4bg for music on a 8gb touch after installing a few apps and games on it ?