I'm buying from the Apple Refurb site, and I've basically narrowed it down to two options. I'm going to be using it mostly for 3D filmmaking using Autodesk (Maya/Mudbox/Softimage), so I know the processing power is going to be a factor. I don't plan on really gaming on it besides "Sims 2" (ahh, 2004), so I don't know how heavily the GPU difference should weigh into it. The two different builds are: 1) 27", 2.7 GHz i5, 6770M / 512 MB. Price is $1,525 after tax. 2) 27", 3.1 GHz i5, 6970M / 1 GB. Price is $1,800 after tax. Looking at it from a pure spec standpoint, the 6970M model is clearly what I'd want to go with, but I'm wondering if the upgrade in the GPU and processor is worth the $275 increase for what I plan on using it for. The $1,800 is about my ceiling on what I can realistically spend at the moment. I'm also aware that this generation is about halfway through its usual lifespan, and so there's a small part of me that just wants to wait until a possible Ivy Bridge update--but there's always gonna be something new around the corner. Any advice is greatly appreciated. Thanks in advance.