After 20 years of PCs, I am researching a move to a Mac Mini. Although I don't need more space, I am interested in adding a faster (more RPM and cache) hard drive. Thinking about the WD Scorpio Blue 500GB. I mean for $90, why wouldn't I do it! I am comfortable cracking the case and installing it. My question is loading the OS (Snow Leopard) and any other pre-installed software (I am planning to upgrade the HDD prior to use). What does it take to load the OS? I am almost expecting someone to say: "insert CD, click prompts, watch progress bar". Is it that simple?