is this a good choice of my imac?http://store.apple.com/1-800-MY-APPLE/WebObjects/AppleStore.woa/9274001/wo/5E2umzKpElzt24ef1a5Dbp1Hsrj/12.?p=0, remember this is a 24 inch g4 imac. the reason im asking is because my friend is saying to get more ram but i dont have enough money, will this be a good choice of my ccomputer?