While the former may be the originators, Powerblock was one of the first brands to take the adjustable dumbbells and give them the upgraded horsepower boost they so desperately needed—aka a heavier dumbbell. The Pro 100 XPs are the best customizable ones you can get. This is a great pair, with enough weight, to start training at home with.
Their unique block-like aesthetics are a great look in any gym, home, or professional, and these are tough enough for collegiate athletic programs, the armed forces, and the pros in between. Right now, the 50-pound knurled set is on sale for an excellent price of $299.