I am thinking of getting a Macbook Pro sometime in June. I was wondering what were the pros and cons of using it not only as a laptop, but as a desktop alternative (attaching a monitor to it) and using it as my desktop. Are there going to be heat issues with it being used as a desktop and always on? Can I use it closed with a keyboard, mouse, and monitor hooked up with no problems? Your advice is appreciated. This would be my first mac.