My current system
CPU: Intel Core i7 3930K OC to 4.5GHz
Memory: 32GB Corsair Vengeance LP
Mainboard: Asus Sabertooth X79
Graphics: Nvidia GTX 680
Storage: 128gb SSD for OS
512gb SSD for games
4 x 1tb sata in raid 0 for general use
4tb sata for backup
Monitor: Dell U2711 27" 2560 x 1440
I have a problem where if there is an empty slot that something can be plugged into it bugs me.

If the case has 5 hard drive bays then it would be rude not to fill them

That's why I have an old GTS 250 in my case as a dedicated PhysX card even thou I don't play any game that use it. But there was a gap that had to be filled.