I'm thinking of purchasing an old iMac g3. I plan on getting one with os 9 and then upgrading to os x 10.0 (better known as cheetah), and perhaps to 10.1. However, most of the iMacs with reasonable prices have 64mb memory, and from what I hear you need a 128mb memory for 10.0. Is this true, or is the 64mb memory good enough?