What do you mean by "bundle software?" List them out. Clean install w/o iLife and include 3 system languages plus HP printer drivers won't take you more than 6GB if I remember it correctly.
one more question ive heard that the available hard disk space actually decreases due to downloaded web pages, temporary files, web history and stuff. there is a program which cleans and deletes useless files on Windows (i forgot what it's called)
how do i clean up the unnecessary files on a mac??