one said:A 512MB memstick will be enough for those usages... GTA PSP supports custom soundtracks
If the gammer is uncomfortable with a 512MB memstick....then get a 1GB one. Memorysticks have gotten to the point where they can do all these little storage needs that next generation games will probably need. A 40GB harddrive would be overkill to store little things like that, the real need for the HDD (in my eyes) is to store MEDIA (Music, Pictures and Video) and to play games that developers feel a HDD is absolutley vital for it to run.