OK so here is the 4k build which pushes the budget a bit. The mobo is a Z97 because when the 980 drops in price soon you can SLI them:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4460 3.2GHz Quad-Core Processor | $178.98 @ OutletPC |
| Motherboard | ASRock Fatal1ty Z97 Killer ATX LGA1150 Motherboard | $103.98 @ Newegg |
| Memory | G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory | $59.99 @ Newegg |
| Storage | Samsung 850 EVO-Series 250GB 2.5" Solid State Drive | $119.95 @ OutletPC |
| Storage | Seagate Barracuda 2TB 3.5" 7200RPM Internal Hard Drive | $71.98 @ OutletPC |
| Video Card | Zotac GeForce GTX 980 4GB AMP! Edition Video Card | $523.99 @ Amazon |
| Case | Rosewill BLACKHAWK-BLUE ATX Mid Tower Case | $63.99 @ Amazon |
| Power Supply | EVGA SuperNOVA NEX 750W 80+ Bronze Certified Semi-Modular ATX Power Supply | $49.99 @ Micro Center |
| Monitor | Acer B286HK ymjdpprz 60Hz 28.0" Monitor | $380.98 @ Newegg |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $1623.83 | |
| Mail-in rebates | -$70.00 | |
| Total | $1553.83 | |
| Generated by PCPartPicker 2015-03-06 20:54 EST-0500 |
Now if you want you can go with a 1440p@60 or 1080p@144mhz and save ~$100 to $150, or put it towards other parts.