This weekend my little sister asked me to try and upgrade her old Macbook since she can't afford to buy a new one. She is running OS X 10.4 (Tiger) on a 2.0 GHz Core Duo processor with, I believe, 512 GB of Ram. The hard drive is 60 GB and completely full. My plan is to put in a bigger hard drive and upgrade to the maximum 2 GB of RAM. I've looked up the requirements for 10.5 and 10.6 and with 2 GB of RAM and a Core Duo processor I can theoretically run Leopard or Snow Leopard. However, my concern is that Snow Leopard is will lag since the processor is over 6 years old now. Will I be OK running Snow Leopard? Will Leopard be a better choice? Should I just stick with Tiger since that is what she already has? She only uses her laptop for internet, iPhoto, iTunes, and Microsoft Office. Any advice is welcome. Thank you in advance.