Memory required for regular use of PSP?

I plan on getting a PSP-3000 when it comes out later this year, and was somewhat intrigued by the bundle that included a 4 gig memory stick and Everyday Shooter. I had initially planned on going with the Ratchet and Clank bundle, but I'm wondering now if it would be worth it in the long run to just go with the four gig model. I plan on using it just for gaming (no music or photos), so would 1 gig be enough for regular use of the PSP? I doubt I'd buy more than 15 titles for the system -- will I be okay on storage? Thanks. Memory required for regular use of PSP?
a game only takes up about 1 mb so I would get the 1 gb unless you want lots of music or demosMemory required for regular use of PSP?
If you don't use your PSP for videos, music etc then a 4 gig is useless to you, if you aren't going to use them then you should stick to a 512mb or 1gig, you'll be saving alot.
[QUOTE=''aarun27'']If you don't use your PSP for videos, music etc then a 4 gig is useless to you, if you aren't going to use them then you should stick to a 512mb or 1gig, you'll be saving alot. [/QUOTE]

Unless you plan to purchase games off the PlayStation Store, in which case a 4 (or more) GB stick is an excellent investment...
Well if you want everyday shooter it is downloadable via the sonyshop, hence the reason the bundle includes a 4gb stick.....id go with the bigger memorystick personally, you never know when more space may come in handy, like the above reply said if you want at some stage to buy games from the sonystore you will want that extra space. The 1gb isnt much if you have acouple of demos on it as well..........
Like Xaos said, unless you decide to buy and download some games off the store onto your PSP, the 1 gb will hold all of your games fine. I have about 15-20 game saves on mine, and somewhere around 10 demoes too on it, and I still have enough space for alot more games.