This is for stocking foot breathables;
Regardless of brand you want to make sure the waders fit properly by trying them on. That usually translates into s little big. You'll want some extra room to get layers underneath in spring and fall. You'll also want extra room for bending, kneeling, doing the stretch step onto a high bank etc. You want to avoid undue stretching/stressing of the seams cause thats the biggest cause of leaks other than busting brush (or wading w/Don ).
Just like clothes not all manufacturers specs are the same. I have two brands of waders, both XL, both supposed to be the same size. One fits perfect; little room in the foot, plenty of room for layers or freedom of movement. The other pair fits but it's "tight" compared to first pair.
If you don't get your boots and waders at the same time make sure you bring your waders and a pair of light to med wool socks to try boots on with. Not all boots are created equal either.
Some people swear by the higher end stuff and others have the same experience with lower end products. Shop around, read reviews, get what you can afford and meets your needs at the moment.