My new Octo has 4GB of Apple shipped RAM and I've been dying to finally try Aperture so last night I took the plunge and downloaded the 30-day trial. I couldn't believe it! I'm looking at my activity monitor and Aperture eats up 1.5GB and 2.0GB. Safari is using 1GB and Mail is using 800MB. I mean with 4 GB I'm seeing only 500MB of free RAM. I'm not even using Handbrake to do any encoding in the background or any other multi-tasking. That's nuts!!!! So here's the question. I have a pair of 1GB OWC RAM sticks from my old MP (667Mhz stuff) that I can send back to OWC for $55 credit and I have about a $200 budget right now. Would you: A) Get 4 x 1GB, or B) Get 2 x 2GB The trade off is that the 4, 1GB sticks would be the best performance-wise but would fill all 8 slots when combined with my existing 4, 1GB modules. The 2, 2GB gives me 2 slots for expansion later.