[ATL_335i]

Z97 gaming 5 gigabyte motherboard- 89.99 with bundle savings
i7-4790k- 279.99 with bundle savings
Crucial Ballistix Elite DDR3-1866 8GB x2- 104.99 or 99.99 with bundle savings
Samsung EVO 850 500GB-Primary for OS and apps- 175 via amazon
1TB toshiba HDD-secondary for more storage- 59.99 on most websites
H55 liquid cooler- 59.99 on most websites
EVGA 600watt Power Supply- 59.99 on most websites

Edit: I just saw you have your own GPU, but the setup above would be a beast and very reliable for either task. I know this because I have the same setup and use it for a Hackintosh and use final cut pro and then dual boot windows 7 for gaming. It runs so cool and is a beast what ever I throw at it.

I know newegg is convenient but, you can save a lot of money if you went to Microcenter (never mind I just saw you are in Germany lol) and bought this as a bundle package you literally would save 150-200$ with the bundle deal. Not to mention they have the cheapest price on pcpartspicker for the 4790k

Case would be personal preference.