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I bought the white MB just one week after the Apple Notebook event on Oct 14.
And I choose the plastic MB over the Al MB because I just couldn't justify the $300 premium. That is almost 1/3 of the purchase price.
I used the $300 I saved when going with the white MB to get CS4.

My MacBook only rarely leaves my desk/apt, so build quality was not my main concern - and build quality is a big plus for the Al.
Also, I don't play games on my MB, so 3D graphic capabilities were not that important too - if it were, the Al is almost a must.
And thirdly, the looks - I don't think that there is any official winner in this category. The Al Mb looks sexy, I must admit,..., but the white plastic MB still wins the "Miss MacBook Award" in my opinion. :D
 
with apple i would always go with the newest of the new.

reasons to get the aluminum over the previous gen:

-100% eco-friendly laptop.
-Aluminum models will most likely last you longer
-The new new display does look sharper than the last
-much more durable
-Slimmer
-lighter
-no oil marks on your track pad
-no future discoloring or cracking
-size and feel of track pad
-better performance

:apple:
 
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