Don't worry about how much juice you'll be using, the Versys as 336watts of power, more than enough for 'its' needs and yours!
I've had Gerbing for over 15 years and they've been great-guaranteed for life. Make sure you get the full liner and gloves, don't go with a sleevless jacket, your forearms will freeze.
The other thing you have to have with heated gear is a Heattroller or thermostat. Full on is way too hot, I run mine about 60% even on the coldest days and I'm toasty.
I've got CozyWinters gloves now, after 15 years or so, they the leather wore through (electrics still worked fine) and they weren't waterproof anymore.
Gustavo has a brand he likes out of Oregon-but can never the name.
Its a big investment with jacket gloves and heattroller, but if you amortize it over 10 or so years or warm comfortable miles it becomes easy to justify.