Powder--coated cases with absolutely no plastic is the way to go.
A case can last many upgrades, so spending a bit extra over a longer lifespan allows your $ to stretch a lot further while being able to enjoy the benefits of a higher quality case.
I have got over 12 years out of two of mine, but I went with Antec rack-mount 4RU's with accessibility to 6 5.25, 3x 2.5" & CD/DVD bay in the front.
The case was reviewed on this site, from memory.
Only down side is some of the cpu cooling fans (that have since come out) are too high to fit under the lid.