Mac Mini: how much RAM is needed?

I'm considering buying a new Mini and will need my system for the following:



-internet

-iTunes (play music, rent movies)

-very light photo editing (Photoshop Elements or similar program but not something heavier like Lightroom)

-MS Word once a month or so



How much RAM is suggested for this usage?

via ehMac.ca http://www.ehmac.ca/showthread.php?t=110513&goto=newpost