Memory dealer recommendations.

[William Gaffga]

When it comes to RAM there is no reason to cheap out. High quality RAM 
is worth the money, just not what Apple wants to charge. As with 
several other people, I highly recommend Crucial. Their product is 
solid and reliable. Sure you can save a few bucks by going elsewhere, 
but it is not worth it ... I used to buy the least expensive RAM I 
could find, all too often that just lead to headaches.

HTH

Wil.