I have a MBP 2.0GHz core duo thats maxed out at 2gb RAM, and its a little tired. A new iMac is in the cards later in the spring but after looking around at macbooks it looks like I can easily upgrade from my MPB for fairly cheap. I use a lot of photoshop and lightroom but store all my work on external drives. I have seen several macbooks with 2.1GHz core 2 duo for $600-$700. Which would also support 4GB RAM. So from a rookies perspective I see it as I would be going from a core duo to the core 2 duo, 2gb ram to 4, a little faster processor and a smaller screen(which would be welcomed for travel). Am I over looking anything? Is it worth my time or would I even notice a difference?