These are the only set of adjustable dumbbells to get. They are the smoothest, highest quality. Do not waste your time and money on other brands. The PowerBlocks are good quality, but they are not as smooth and fast to adjust and they are actually more expensive.
Get the big ones—the 1090’s. They range from 10 to 90 lbs. as opposed to the smaller ones that go only up to 52 lbs. You’ll need more than that to do Bent Over DB Rows, and Bench Press, so the 90 lb version will work great. They cost $600 and while that might seem like a lot, they replace 17 pairs of dumbbells and are actually CHEAPER than buying all of those separately. Take a look at this set of dumbbells. It has only 10 pairs, only goes up to 50 lbs and costs $600. Look around at others that go up to 90 lbs like the SelectTechs and you’ll see how much they cost. Plus, you’ll end up with a huge mess of dumbbells and will need a rack (even more $). The space saving factor alone is worth a couple hundred!
Check out this review of the Bowflex SelectTechs: