I'm looking at buying a new Laptop to replace my old 06 blackbook. Have been looking at the current pro line up and some refurb models and has lead to the choice between the base 13" 2011 and the 2010 15' refurb. Size/Form factor isn't the biggest issue. The half kilo weight is nothing to me in my backpack which can also comfortably hold a 15". My biggest concern is the CPU speeds. the 2010 has a 2.4GHz Intel Core i5 and the 2011 has 2.3GHz dual-core Intel Core i5. HDD are same size, I know 330m graphics is better then HD3000. I do a bit of Video editing at uni but nothing too extreme. My biggest concern is the CPU power of the 15" refurb against the newer sandy bridge processor it's faster clocked but has less cache wondering if this makes much difference? If not i may opt for the Larger 15" with the better 330m Graphics. EDIT: Does anyone know the CPU model numbers?