PS3 Hard Drive Space.

[Stu]

We don't have GameStop here. And I'm not a complete and utter fucking moron, thank you very much.

I did say most, there's always exceptions to the rule!

[Umon Daisuke]

And I'm pretty sure the internal hard disk has to be NTFS formatted. When I get up to that bit I can confirm.

Not quite, it's Sony's own proprietary FAT and as such, getting a faster HDD or one with a larger cache doesn't do much. All it does is shave off a few seconds from some game/demo installations.

If you did get a 7200RPM one, don't worry, the heat sink in the system is pretty good. Someone tested that a while back and both 5400 and 7200RPM HDD's read similarly.
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As many have noted, it's easy as pie to upgrade so the only issue on hand is whether you have a lot of data to back up to or not. I have a core 20GB that I got at launch and I needed to upgrade by April. I put a 160GB HDD and after 2 years, I've still got 80GB left (even with mandatory installs).