Hi all. First post here. Hope to get some good advice At the moment I have a macbook (white) 2008 13'3". Specs: 2.1 core2duo, 4 gb ram and 128 gb hd I use it apart for internet most of the time for Aperture (2). When more then Aperture stands open i do get a couple of page outs and about 1 gb ram is stil available. But the cpu is constant at 100% when doing things in Aperture. My question is: Actually the 15" is to expensive. Now I am doubting between. 13" MBP 2.5 I5 and 8 gb ram or 13 mba with 1.8 I5 (256 sdd model) But I have got a couple of questions. 1. The pocessor in the MBA is only 1.8ghz, so it is 300 mhz slower the my current. Is it 'faster' compared to my current macbook because it is a newer generation cpu? 2. If I opt for the 2.9 13" MBP or a 2.0 I7 for the air, am I going to notice the difference in speed going for the more expensive models? 3. Or do I really need the quad core 15" because aperture is at the moment my processor hog? Any opinions for what 13" model to go for, for my needs? I do not care about weight..