I love the iMac as the main driver for my family of 5
* We want a dedicated space in the house for a family computer, so portability is no concern
* It has a very small footprint
* It looks the most like "furniture" out of all the options I've seen; pretty color & form factor, and no mess of cables. If you're male, think "wife approval factor".
* It does everything the family needs from it; runs Steam, documents, spreadsheet, browser, school, photos/videos, etc
* High interoperability with our family iPhones/iPads