What's your budget? Are you able to spend the money without issue or are you constrained? If you have the money, I would probably build a nice system for yourself and convert that to a media PC.
comparison of the 950 vs 4690k
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4690K 3.5GHz Quad-Core Processor | $222.75 @ OutletPC |
| CPU Cooler | Cooler Master Hyper 212 EVO 82.9 CFM Sleeve Bearing CPU Cooler | $28.98 @ OutletPC |
| Motherboard | Asus Maximus VI Hero ATX LGA1150 Motherboard | $158.49 @ OutletPC |
| Memory | G.Skill Ripjaws X Series 8GB (2 x 4GB) DDR3-1600 Memory | $59.99 @ Newegg |
| Video Card | MSI GeForce GTX 970 4GB Twin Frozr V Video Card | $333.98 @ Newegg |
| Case | Fractal Design Define R5 (Black) ATX Mid Tower Case | $107.99 @ SuperBiiz |
| Power Supply | SeaSonic 620W 80+ Bronze Certified Fully-Modular ATX Power Supply | $75.99 @ SuperBiiz |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total (before mail-in rebates) | $1061.17 | |
| Mail-in rebates | -$73.00 | |
| Total | $988.17 | |
| Generated by PCPartPicker 2015-03-07 12:21 EST-0500 |
I did NOT include any storage as you said you already have them. This would be my ideal build and something that would last you for at least a few years.