Entirely your choice. An interesting option is buying a cheap card now to give you some gaming ability and then buying dual flagship Pascal cards when they come out.
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i7-6700K 4.0GHz Quad-Core Processor | $399.99 @ Newegg |
| CPU Cooler | Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler | $29.44 @ Amazon |
| Motherboard | Asus Z170-A ATX LGA1151 Motherboard | $154.99 @ Amazon |
| Memory | G.Skill NT Series 16GB (2 x 8GB) DDR4-2400 Memory | $66.99 @ Newegg |
| Storage | Samsung 850 EVO-Series 250GB 2.5" Solid State Drive | $87.99 @ Amazon |
| Storage | Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive | $51.99 @ NCIX US |
| Video Card | EVGA GeForce GTX 950 2GB Superclocked Video Card | $139.99 @ Amazon |
| Case | Phanteks Enthoo Pro ATX Full Tower Case | $99.99 @ Amazon |
| Power Supply | Corsair RMx 1000W 80+ Gold Certified Fully-Modular ATX Power Supply | $159.99 @ Newegg |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | $1191.36 | |
| Generated by PCPartPicker 2016-02-07 17:54 EST-0500 |
This is sort of like building a Lamborghini around the engine of a Honda Civic. It could go 200MPH but you are limiting it to 60 until the speed limit gets changed.