Well, in the real world I don't think those small differences in processor speed would be noticeable. I was trying to find ones of mostly equal specs but it is difficult to find identical ones. I think the comparisons are pretty good.
I'm sure you can find refurbs of Windows machines too but do they come with full manufacturer backing and warranties as well?
Bluetooth is very useful for syncing to many devices and if you want to use a wireless mouse with it. Lot's of interesting gadgets are now incorporating bluetooth so i think it is a useful feature.
Firewire as well. File transfers to a firewire HD are way faster than USB2. I haven't done a comparison with eSATA but I suspect firewire is still faster. Mostly it is storage but I think plenty of cameras still have firewire as well.
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