Need internal hard drive 1tb

I want to buy hdd 1 tb around 4k. I saw great deals on md computers. Price apart which gives better long term reliability. Seagate or wd? Also which has good and sensible customer care of two. I live in jharkhand. So nearest Metro is Kolkata. Please reply at earliest. I would do heavy gaming. I already have two hdd. One is 3 yrs old hgst 500gb other is Seagate 1tb.i hope i wont face problem if i attach third hdd. My mobo is gigabyte 78lmt-usb3. Psu is antec vp 650p.