Probably my current rig with 2 980s and a 4K monitor
edit: here's my current build
Processor: Intel i7 4770K Quad Core
Memory: Corsair Vengeance 16GB (2x8GB) DDR3 1600 MHz
Motherboard: Asus Z87 PRO LGA 1150
Power Supply: FirePower Silencer MK III 750W
Video Card: Asus GeForce GTX770 2GB GDDR5
Blu-ray burner: ASUS 12X Blu-ray Internal Burner Drive with Disc Encryption
SSD: Samsung 840 Pro Series 2.5 Inch Solid State Drive, 256 GB
Hard Drive: Western Digital Caviar Black 2 TB SATA III 7200 RPM 64 MB
Sound Card: ASUS PCI-Express x1 7.1 Channel Sound Card
Speakers: Logitech Z623 200 Watt Speaker System
OS: Windows 8.1 Pro
Case: NZXT Technologies H2 Classic Silent Midtower Chassis
Mouse: Razer Naga
Keyboard: Razer Deathstalker
Headset: Corsair Vengeance 2100 Wireless 7.1