Hi there, We are a small architectural business looking to purchase a new iMac. We currently own and obtain two iMacs at present. Our most recent iMac purchase / specification is as follows; 21.5" 3.2 GHz i3, 8GB DDR3 SDRAM, 1TB Harddrive, AMD Radeon HD 5670 Graphics Card. Our everyday use entails; emails and word processing with our main use using architectural software. Our architectural software includes; ArchiCAD v15, Artlantis v3.0 and Photoshop CS5. My question to you is, what system / specification stated below would match our most recent purchase and run our architectural software sufficiently / smoothly to its full potential. We see and hope that the preferred / chosen option would at least last us another five years, minimum. OPTION ONE: 21.5" 2.7 GHz i5 or 2.8GHz i7?, 8GB DDR3 SDRAM, 1TB Harddrive, AMD Radeon HD 6770M 512MB Graphics Card. OPTION TWO: 27" 3.1 GHz i5 or 3.4GHz i7?, 8GB DDR3 SDRAM, 1TB Harddrive, AMD Radeon HD 6970M 1GB or 2GB? Graphics Card. I look forward for your thoughts and opinions regarding our queries above.