I have a late 2009 iMac 2.8ghz i7 loaded up with 1tb hdd, 12 gb ram, etc. I'm thinking of upgrading imacs. I found a 2011 2.7 i5 for $1350. Do you think it's worth the upgrade? Would a current model 2.7 i5 be faster than an '09 2.8 i7? I do a lot of Final Cut and a ton of Aperture work. Thanks!