You could install yumex or any other GUI front-end for YUM and just check off the ones you want to update.
Note, however, that YUM will do a dependency resolution, so, given your selection, you may need to install additional packages. I.e., you will find it quite hard to limit your download size to 250 Mb chunks.
In fact, I'd start by looking at the YUM output you first got to see what dependency resolution files were included for several applications. Then update those first, or at least put them into the same "chunk."