Hello, I want to buy new MacPro 8-Core and I have some questions: 1.If I buy it with 2x Quad 2.26 GHz can I change it with 2.93 later without buying additional parts (Fans, Heatsinks and so on...) ? 2. Is it better to wait until January ? 3. What is the difference between the RAM that Apple sales ( 32GB = 3700$) and this that macsales.com sales (32GB = 1250$) ? P.S. : I study architecture and I will use it for rendering (V-ray), Photoshop and Archicad.