I'm going to be buying my macbook within a week but want to buy the ram seperately. I am wondering about the expandability of the ram slots. It looks like if I go with the cheapest option, as I was intending to, they give you 2 256pieces. I was hoping to buy seperately a couple 1gb chips but am wondering if they solder the pieces in, or what is the best route, if I can get ram elsewhere cheaper.