Just a quick comment on the last post, these days with 20-60gb game installs, 256 gb is just not enough for your OS drive if you plan to also use it to install games.
Go with the 480+ gb, as every single game i know installs at least 5 games at one time on their machine. I don't know anyone that will install a game, play it to the end, uninstall it, then install the next game the will play. THey install multiple games and switch between.
You will quickly see the limit on the 256 gb if you are planning on installing the latest games.
If you're going to go with a HDD and SDD combo, possibly consider an SSD cache drive to boost your system performance, or look into hybrid drives.