Here is my problem.. I am buying my first Mac and my main issue is speed and the computer not slowing down with programs running. Which would be better... a regular ($999) macbook white with an upgrade to 4gb of ram or an aluminum macbook with 2gb of ram. The aluminum macbook has the DDR3 that runs faster but is this better than 4gb of the DDR2 ram. Please let me know what you guys think. Thanks!