I would get a build like this:
PCPartPicker part list: http://pcpartpicker.com/p/xG42zy
Price breakdown by merchant: http://pcpartpicker.com/p/xG42zy/by_merchant/
CPU: Intel Core i7-4790K 4.0GHz Quad-Core Processor ($309.99 @ Amazon)
CPU Cooler: Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler ($28.99 @ Micro Center)
Motherboard: ASRock Fatal1ty Z97 Killer ATX LGA1150 Motherboard ($114.99 @ Newegg)
Memory: G.Skill Sniper Series 8GB (2 x 4GB) DDR3-2133 Memory ($82.99 @ Newegg)
Storage: Seagate 1TB 3.5" 7200RPM Hybrid Internal Hard Drive ($77.99 @ Amazon)
Video Card: EVGA GeForce GTX 970 4GB ACX 2.0 Video Card ($329.99 @ Amazon)
Case: Thermaltake Commander MS-I ID ATX Mid Tower Case ($34.99 @ Micro Center)
Total: $979.93
Prices include shipping, taxes, and discounts when available
Generated by PCPartPicker 2014-10-17 15:53 EDT-0400
Use the CX750 you've bought and when you decide to SLI,get a higher quality 850W PSU,like the XFX COre 850W,EVGA G2 850W,Antec HCG 850M,Rosewill Capstone 850M and others.