I recently purchased a 2012 Air with a 1.8 i5, 8 gigs of ram, and a 256 gb ssd. I don't exactly need the 8 gigs of ram, but I got it so that my machine will last 4 years+. Now I'm wondering if I should change my configuration to the i7, but I'm not really sure that it will make the machine more future proof than the i5. I do some Aperture and Final Cut Express editing, along with the usual web browsing and iTunes. So basically my question is within the next 4 years will there be a point where the i5 will feel slow compared to how the i7 would feel, or will the difference never really be noticeable?