The recent price drop of Datels 4GB Hard Drive to $99 and the Sandisk Memory Card down to $147 has brought bigger storage down to a much more affordable price, last i remember Sonys 4GB option was to be released with a $220 price.
So you have the 2 Storage Options above, the Sandisk Memory Card is 47 dollars more expensive but fits in the PSP and doesnt add any weight or dimensions to the PSP and from reports writes faster and is better for movies.
The 4GB Datel Drive breaks the 100$ barrier which is around £54 but it is bulkier and theres reports of stutters in movies.
OK taking the 2 Storage Options in and the price, size and compat problems etc, Which is the best Storage Option for the PSP ?