I am the lucky recipient of twenty $25 Amazon gift certificates. I have an Amazon card and use it only to charge items for business so I am reimbursed for all the bills. I get a $25 certificate for each $2500 I spend on the card. Now that my iMac G5 is on order (20", 1-512MB stick, BT, AE), what should I buy from Amazon? I have a BT KB already. Which 512MB stick from Amazon is correct? Oh yeah, I'll receive 4 or 5 more next week.