The witcher 3 is apparently hugely demanding so getting it to run on high with no frame drop will be challenging.
I(d go with something like this:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i5-4460 3.2GHz Quad-Core Processor | €167.50 @ Mindfactory |
| Motherboard | Gigabyte GA-B85M-D2V Micro ATX LGA1150 Motherboard | €48.15 @ Amazon Deutschland |
| Memory | Crucial 8GB (1 x 8GB) DDR3-1600 Memory | €26.99 @ Amazon Deutschland |
| Storage | Crucial BX200 240GB 2.5" Solid State Drive | €61.74 @ Amazon Deutschland |
| Video Card | EVGA GeForce GTX 970 4GB Superclocked ACX 2.0 Video Card | €305.94 @ Mindfactory |
| Case | Rosewill SRM-01 MicroATX Mini Tower Case | €37.61 @ Amazon Deutschland |
| Power Supply | XFX XT 500W 80+ Bronze Certified ATX Power Supply | €49.85 @ Mindfactory |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | €697.78 | |
| Generated by PCPartPicker 2016-05-27 18:14 CEST+0200 |
Or, with the new GTX 1070 that is about to come out (10th of june), when we'll know for sure the price in Germany, and have been able to compare a lot of benchmarks, it may be worth going for this:
PCPartPicker part list / Price breakdown by merchant
| Type | Item | Price |
|---|---|---|
| CPU | Intel Core i3-4160 3.6GHz Dual-Core Processor | €110.55 @ Amazon Deutschland |
| Motherboard | Gigabyte GA-B85M-D2V Micro ATX LGA1150 Motherboard | €48.15 @ Amazon Deutschland |
| Memory | Crucial 8GB (1 x 8GB) DDR3-1600 Memory | €26.99 @ Amazon Deutschland |
| Storage | Crucial BX200 240GB 2.5" Solid State Drive | €61.74 @ Amazon Deutschland |
| Case | Rosewill SRM-01 MicroATX Mini Tower Case | €37.61 @ Amazon Deutschland |
| Power Supply | XFX XT 500W 80+ Bronze Certified ATX Power Supply | €49.85 @ Mindfactory |
| Other | GTX 1070 | €400.00 |
| Prices include shipping, taxes, rebates, and discounts | ||
| Total | €734.89 | |
| Generated by PCPartPicker 2016-05-27 18:16 CEST+0200 |