If you feel you're capable to build your self rather than just buying the rig straight off you could have a much computer which already has a 970 and decent PSU in it. Something along the line of this.
PCPartPicker part list:
http://de.pcpartpicker.com/p/4mWmZL
Price breakdown by merchant: http://de.pcpartpicker.com/p/4mWmZL/by_merchant/
CPU: Intel Core i5-4460 3.2GHz Quad-Core Processor
Motherboard: Gigabyte GA-H97-D3H ATX LGA1150 Motherboard (€103.89 @ Home of Hardware DE)
Memory: Corsair Vengeance 8GB (2 x 4GB) DDR3-1600 Memory (€57.61 @ Amazon Deutschland)
Storage: Western Digital Caviar Blue 1TB 3.5" 7200RPM Internal Hard Drive (€56.61 @ Home of Hardware DE)
Video Card: Zotac GeForce GTX 970 4GB Video Card (€327.99 @ Amazon Deutschland)
Case: BitFenix Comrade ATX Mid Tower Case (€38.91 @ Amazon Deutschland)
Power Supply: SeaSonic 520W 80+ Bronze Certified Fully-Modular ATX Power Supply (€60.50 @ Amazon Deutschland)
Optical Drive: Lenovo 41N5618 DVD/CD Drive (€12.80 @ Amazon Deutschland)
Operating System: Microsoft Windows 8.1 DE OEM (64-bit) (€100.56 @ Home of Hardware DE)
Total: €758.87
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2015-07-06 15:53 CEST+0200