I'd swap the R7 out for a 750Ti personally and do this. The 750Ti is still a capable card, has life left in it, and is also cheaper than the R7.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4690K 3.5GHz Quad-Core Processor | $303.33 @ Vuugo |
| Motherboard | Gigabyte GA-B85M-D3H Micro ATX LGA1150 Motherboard | $80.57 @ Amazon Canada |
| Memory | Crucial Ballistix Sport 8GB (1 x 8GB) DDR3-1600 Memory | $58.46 @ DirectCanada |
| Storage | Seagate Barracuda 1TB 3.5" 7200RPM Internal Hard Drive | $56.33 @ Vuugo |
| Video Card | EVGA GeForce GTX 750 Ti 2GB Superclocked Video Card | $169.99 @ NCIX |
| Case | Cooler Master N200 MicroATX Mid Tower Case | $56.24 @ DirectCanada |
| Power Supply | EVGA 500W 80+ Certified ATX Power Supply | $49.99 @ NCIX |
| Operating System | Microsoft Windows 10 Home OEM (64-bit) | $122.00 @ shopRBC |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $916.91 | |
| Mail-in rebates | -$20.00 | |
| Total | $896.91 | |
| Generated by PCPartPicker 2015-10-15 16:37 EDT-0400 |
You'll be fine on the 750Ti at 1080p for some time. You can look into upgrading it sometime in late 2016 or early 2017 (at the earliest) when the next gen video cards have come out. We'll either see the next gen cards and their high bandwidth memory be so awesome we all want one. If they're more of an incremental improvement, they'll still drive down prices on things like the R9 390 and GTX 980Ti.