Here are the kettles i have tried and love. I use a hot water tower programmed at 207*F.
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Fellows kettle which you can keep on a small induction cook top to keep the temp consistent through your pour. Great control and ergonomics are great. Also has a thermometer. Very comfortable to hold and use. Well thought out by their engineers. They have a new kick starter for a new kettle and heater system that is amazing.
https://www.kickstarter.com/projects/fellow/stagg-ekg-the-electric-pour-over-kettle-for-coffee?ref=nav_search -
Monarch methods from Canada has great copper kettles (320ml and 500ml). Small, easy to use, held comfortably in one hand. Covered on laser cut wrap to protect your hand. Also has a thermometer. I always pre heat the kettle to keep the temperature consistent.
https://goo.gl/images/VSqAr3 -
Takahiro kettle from Japan is awesome. One downside is the cost. However the control is its mainstay. They come in .9l or .5l. Truly one of the best.
https://prima-coffee.com/equipment/takahiro/kettle
These are my favorites. I have used just about everything out there. Hope this helps.
Ben