Wanted to ask how much power would my system needs.
Specs:i5 6600k
MSI Z170a gaming pro
Corsair vengeance ddr4 ram 16gb(2x8gb)
R9 290x
Maelstrom 120k cooling kit
1 normal 120mm fan
2 hard drives
1 Samsung Evo 850ssd
I usually plug in my gaming mice and gaming keyboard, my Webcam, speakers and a BenQ xl series monitor.
I used to use 750w cooler Master psu, was that enough? If not how much more power do I need and any brand/model psu recommendations?

Load Wattage: 498 W
Recommended PSU Wattage: 548 W

Recommended Power Supply:
Cooler Master Power Supply Cooler Master GM Series G650M - Compact 650W 80 PLUS Bronze Modular PSU (6th Generation Skylake Support)

try out urself http://www.coolermaster.com/power-supply-calculator/

cooler master is the last brand i would recommend..

Would a cooler master g 700w be okay for this???

750w is more than enough. If nothing wrong with your PSU, then there's no need to change. If you are in the mood to waste money, then upgrade to whatever that cost a shit load of cash. Make sure it's at least Gold rated tho. Okay, generally, Seasonic's range are very safe.

www.jonnyguru.com (the site to go for PSU reviews)

if yr budget is tight, get at least 600W from superflower tier 1 but i highly recommend 750W is more safer bet.

TS go for Tier 1 PSU u won't get wrong.