Ok, I know there a lot of questions out there about RAM and stuff but here is my dilema. I have a MB w/ 1gb of ram and an iMac CD with 512mb, my question is should I just buy another 512mb for the iMac CD or by a 1gb stick for the MB and put the extra 512mb in the iMac. I ask this because i've read here that if you go from a gig the next step is 2gigs. I guess what I'm asking is should I go from 1 to 1.5?