I'm currently on a Samsung 840 EVO SSD as my system drive, with a 2TB WD Green, a 3TB HGST Deskstar NAS, and a 2TB Seagate Barracuda 7200.14 for storage.
The SSD has around 1 year of actual power-on time, the storage disks each have around 1.5-2 years of power-on time. No failures reported by SMART so far.
You could say I'm sort hedging my bets by not sticking with a single vendor. The SSD will probably be the first disk to go, due to the firmware issues on the 840 EVO drives. It's been good so me so far, though.