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.

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.

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.

aarun27