This is my first Mac and I'm just about to pull the trigger on it. Been a PC user for 15+ years and feel it's time for a change. I know I want the 27" but I'm on the fence about the 27" model I want. Is the top end model really worth $400 more? It will eclipse my PC obviously, but what about the $1699 model? Currently I do web design (a lot of graphics with Photoshop, etc.), some video editing (Premiere Elements), light gaming, watching videos (Netflix), and of course E-Mail, browsing the internet, and some word processing. Currently, I own a PC, 2.8 GHz, 8GB RAM, 23" monitor, 1GB Video Card, 1TB HD. If I upgrade, the following models are what I'm on the fence about. Obviously I can upgrade the RAM. But Apple allows no CPU configuration options for the $1699 model. Why?? Why can't I just upgrade the CPU or the video card? Anyway, will the lower model, while saving me $400, be just fine? Is the performance difference betwen a 512MB Video Card and 1024 MB card worth spending an extra $400+ on the $1999 model and upgrades? My other question is what's the performance gain on over my PC that I will experience on the first model compared to the second model? Should I wait until I can afford the $2k+ model or will the $1699 iMac suit me just fine when I upgrade to 16GB of RAM? 2.7 GHz Quad-Core i5 4GB RAM (plan on upgrading to 16 GB from NewEgg) 1 TB HD AMD Radeon 512 MB $1699.99 3.4 GHz Quad-Core i5 4GB RAM (plan to upg to 16GB) 1 TB HD AMD Radeon 1GB $2000+ Thank you in advance for your help.