I’m not too big a fan of KB’s. They’re really expensive after shipping, and most of the things you can do with them you could also acheive with a sandbag or dumbpell.
However,
I have a 24kg that works well for high-rep swings. If I could do it all over again, I would have purchased a heavier one (or not at all).
I am not sure of the brand, and I havent stepped intho the relm of kettlebells yet, but I believe you can find one that you fill yourself so you can vary the weights.
It’s refillable with steel shot. Empty, it weighs 8.8lbs and can go up to 60+ pounds when fully loaded. One advantage (besides only needing one kettlebell for a variety of lifts or people) is that the shifting of the steel shot inside the kettlebell will help you perfect your form when performing kettlebell swings and other exercises.
I think the ones you are looking at buying would be good for your current strength levels. I would say though, through personal experience that as I got stronger I found myself needing a 2 pood kettbell (around 70+ lbs) for my swings and cleans.
I can always go bigger when i get stronger/fitter. The goal is fitness, burning calories and functional strength with them though, i’ll still be doing my dead’s, squat’s, bench, dips, pull ups, presses etc as per usual 4 times a week.