(be gentle with me....serious knowledge deficit here) Okay, so my new Macbook will come with 1GB of memory. I need to up that to 2GB for the programmes I will be using, but will probably go for a total of 3GB because the prices at Crucial (Europe) are so cheap. But....my options on Crucial are: (a) 1GB (b) 2GB (2 x 1) (c) 4GB (2 x 2) Where is the option to buy a 2GB stick? If I have only two slots how can I end up with 3GB with the above options? Help?