Your best bet is the standard 20 gb (unless you have an HDTV). I have a 20 gb can install 2 games at a time while having a few arcade titles and a bunch of saves. The only way you should get an arcade is if you can find a cheap Hdd and the price works out better going that route. The install feature is an absolute godsend. It is so nice to not have to listen to the obnoxious noise it makes while running off the disc. Most games take about 5 minutes to install and it keeps your system cooler so the RROD is not such a huge worry (since you may not get the jasper chip one).Draco Kaiser said:I don't want to store the real game, just saving the file... well maybe save a couple games.