Just my 2 cent here. I am not sure of your lifting background, but with my clients I most inexperience men can use the 35lb/16kg very quickly, if you are an experience lifter, 1-2 yr consistent training already under your belt, then I would go with the 20kg/44lb or even the 24kg/53lb.
They aren't hype they an excellent tool, I think that people have a hard time getting around that because some in the KB community have promoted them as the be all end all in the past.
I am partial but for the price and quality of bell, go with Ader Fitness excellent bells. They are out of Dallas, if you are local you could even pick them up.
The can be found at aderfitness.com
If need training info and video demonstration you can go to many places I am involved with a site the focused on KB education we have some and will be putting up more programs and videos as time goes on. The site is called azkettlebells.com
If you have any other questions feel free to PM me