Hi istoryans!

I need your suggestions. Please help me choose a good UPS for my RIG and how much VA would I need? Only my System Unit and Monitor will be connected to my UPS..I need to find a good UPS, only mainly use just in case there is a power failure so that I can shutdown my PC properly, save my files, etc maybe 3-5minutes.

Power Supply:
Corsair HX750

Specs:
Intel Core i7-4770k @4.2Ghz
Gigabyte G.1 Sniper M5
Colorful GTX Titan
Corsair Dom Plats 2x4GB
SanDisk Extreme 120GB
Western Digital 1TB

I'm not so sure how much power can draw from the wall of my RIG at 100% full load so need your suggestion instead how much VA I need.