We use mostly round pyrex with the blue plastic lids. i also have some anchor hocking that is the same size, but the lids aren't as nice. thought I was saving a bit of cash, but they ended up disappointing me. (all lids dont fit on all containers, despite being same brand/size. weird.
we have I think eight 2-cup bowls, four one cup bowls, two 7 cup bowls, and one 5 cup. the rounds dont nest as well, but i figure it forces me to use leftovers, and if we're running low on containers, the fridge probably needs to be cleaned out! I'd like one more of each of the larger sizes.
We lean the lids against the back of the cabinet in a line, and they stay just fine. Our cabinet looks so nice, with simple clear containers stacked up instead of the old hodge podge of 8,000 plastic things in different sizes and colors!
we have a pyrex/corning outlet about an hour away, and that's where I plan to pick up some rectangular ones when i can ustify the expense. they also have a website
where you might find some good deals...?
I agree with a PP that the wide mouth mason/canning jars would work nicely for some things too.