Speedlights don't weigh very much, so it's not a matter of how much weight the stand can hold...but it's more a factor of what your uses are and what is convenient for you.
If you are using it for on-location work, you might not want a really heavy stand and might prefer one that is lighter and easier to carry. In a studio, you might want very sturdy, so that it can hold anything you might put on it. Or on the other hand, you might not have a lot of space, so you would want one with a small foot print (at the cost of being less sturdy).
Maybe you want one that is really high, or maybe not. Maybe you want on with more sections, so that it collapse down smaller for easy transport.
Or maybe you just want something cheap?
Lightstands
Also, to mount a speedlight, you will need some sort of adapter. The Canon 580EX comes with a 'foot' that will hold the flash and has 1/4" thread on the bottom, which make it easy to mount to a tripod or light stand (with 1/4" stud).
Another popular method is with an umbrella adapter.
Impact | Umbrella Bracket | 3117 | B&H Photo Video