Hey all, I need your insight and advice. I've got a 17", 2.16 GHz, MBP with only 1 GB of RAM. It works wonderfully and I LOVE the new OSX! However, I want to upgrade my memory to 2 GB (the maximum with my processor). Can I get by with only buying a 1 GB stick and supplementing my existing memory, or do I need to buy a completely new set of 2 x 1 GBs? Does it matter if the brands of the memory differ? I've heard it's not that good of an idea... Sorry if these are dumb questions. Thanks in advance!