I'm looking to upgrade from my 2007 MacBook Pro (2.2 GHz Core 2 Duo) as it will be turning 5 years old later this month. These are the three different models that I'm currently looking at: 1) Refurbished MacBook Pro 2.5GHz Quad-core Intel i7 Originally released October 2011 15.4-inch (diagonal) LED-backlit Hi-Res antiglare widescreen display, 1680-by-1050 resolution 4GB (2 x 2GB) of 1333MHz DDR3 SDRAM 750GB Serial ATA @ 5400 rpm 8x double-layer SuperDrive (DVD±R DL/DVD±RW/CD-RW) Intel HD Graphics 3000 and AMD Radeon HD 6770M $1,859.00 2) 15-inch: 2.3 GHz Retina display 2.3GHz quad-core Intel Core i7 Turbo Boost up to 3.3GHz 8GB 1600MHz memory 256GB flash storage1 Intel HD Graphics 4000 NVIDIA GeForce GT 650M with 1GB of GDDR5 memory Built-in battery (7 hours) $2,229.00 3) 15-inch: 2.3 GHz 2.3GHz quad-core Intel Core i7 Turbo Boost up to 3.3GHz 4GB 1600MHz memory 500GB 5400-rpm hard drive1 Intel HD Graphics 4000 NVIDIA GeForce GT 650M with 512MB of GDDR5 memory Built-in battery (7 hours) UPGRADE to Hi-Res antiglare widescreen display, 1680-by-1050 resolution $1,929.00 The main differences that I'm looking at: - Processor: 2.3 Ghz i7 Ivy Bridge (Lowest option from this year) vs 2.5 Ghz i7 Sandy Bridge (Highest option from last year)? - Graphics: GT 650M 512MB vs. HD 6770M 1GB? and GT 650M 1GB vs. HD 6770M 1GB? - Price: are the differences between the three worth it for the performance ($400 from 2011 Refurb to 2012 Retina)? Since I'm upgrading from a 2007 MBP I'm sure that any of these would be a huge leap though. Any knowledge and advice is greatly appreciated, thanks!