I've used the cinderblock & board method as well...although I think we used some overthick boards.
Currently, I'm using shelves from Haverty's- sturdy as heck, but the back does have a tendency to bulge a bit. That doesn't matter since they're against the wall anyway.
However, if you have the money, check out Container Store's Intermetro shelving. Its the stuff they use in professional spaces, and depending on the line, holds several hundreds of lbs per shelf. Its available in 3' to 6' tall heights, 3' to 5' widths, and depths of 14" to 18".
We have that up all over our house for storage, and even under the weight of a Dragon collection back to issue 30 something, tubs of unopened Chainmail minis, and other RPG stuff, they simply don't sag. Mostly, I'm more worried about the floor they're on...like being in the attic over my car.
Currently, I'm using shelves from Haverty's- sturdy as heck, but the back does have a tendency to bulge a bit. That doesn't matter since they're against the wall anyway.
However, if you have the money, check out Container Store's Intermetro shelving. Its the stuff they use in professional spaces, and depending on the line, holds several hundreds of lbs per shelf. Its available in 3' to 6' tall heights, 3' to 5' widths, and depths of 14" to 18".
We have that up all over our house for storage, and even under the weight of a Dragon collection back to issue 30 something, tubs of unopened Chainmail minis, and other RPG stuff, they simply don't sag. Mostly, I'm more worried about the floor they're on...like being in the attic over my car.