Both for $1700. 4GB of ram, 1TB hard drive. The main difference is the GPU. Help me decide. Basic tasks: iTunes, Chrome surfing, Lightroom 3, Photoshop CS5. Advanced tasks: encoding DVD rips. Not necessary for me to have them done in 30 minutes though. On my Mac, I literally don't have many apps installed. Only: Chrome Lightroom 3 Photoshop CS5 VLC Handbrake iPhoto iMovie iTunes Seriously, that's all the apps I would have installed on there (other than the native OS X apps).