Hi guys , i did upgrade my processor to an i7 4790k and now i just need to upgrade my PSU (Right now i have Zalman ZM-500LX) and my good 2yr old R9 270x . My problem is at the GPU , i don't know what to buy between the GTX 970 , R9 390 and R9 390x . Wish i could afford a GTX 980 but unfortunately i can't. Keep in mind that i do Gaming videos on youtube .