It will depend on your budget and preference. If you are a pro audio, video editor, then will you need 12 to 16 GB of RAM, apart from GPU.
i am just a beginner so for now smaller the budget the better but i also have 32GB of corsair dominator platinum ram cards just in case i need it
Ok, 32GB of RAM is more than enough for your need. But we are back to square one again, what is your budget my dear friend ? GTX 760 or 770 can do the job or you can go with AMD too.