I've used several Antec cases for 2-3 builds each over the years -- an SLK-xxx for a music server then a gaming PC, an NSK-4xx for a work PC then gaming PC, etc.
I bought a new Antec P280 for my 2012 gaming system since I wanted a modern design instead of a 2005 one, and needed the room and better airflow to put in a GTX-680. I might use the P280 for another decade.