I recently purchased a set of PowerBlock adjustable dumbbells. Probably one of the smartest fitness purchases I have done. I own the PowerBlock Classic 45. These dumbbells can adjust from 5 to 45 pounds in 5 pound increments. This is all I need at this point, but they do have other sets that are capable of being upgraded to go as high as 130 pounds if you are looking for more weight.
There are newer versions that have more room inside the handles as well. The Sport 5.0 and Sport 9.0 series are the latest generation that have a little more room between the handles and actually go up to 50 pounds.
I was motivated to buy them because I am doing the P90X workout program. For a guy doing the classic version of the program and trying to build a little muscle, you really need to be lifting dumbbells to get enough strength training resistance. The PowerBlocks were a perfect fit for my house because I really don’t have the room at my house to store it, nor do I want to pay to have a rack of dumbbells with the same range.
If you are looking for some dumbbells and are tight for money/room, then these dumbbells are a good option. I simply bought my used in the city I live in, but you can find them wherever. There are a few different brands too. The other popular one are the Selecttech Nautilus ones that Bowflex is affiliated with.