A Globalwin 802 which I bought from OcUK, I did have a couple of cases I bought from an office and business computing place a few years before for my first ever builds, but 'proper' case, I would say the 802 in beige (these were heavily modded at the time by people and could be purchased in black later on iirc which was fairly unheard of then)
To expand a bit further, I notice a lot of people mentioned the Chieftec Dragon, well that was what I actually replaced the 802 with, a silver Chieftec Dragon, but this was a few years later in the socket A Athlon era iirc where as the 802 was bought in the prior era of the socket 370 Celeron's, I had a Celeron 300A overclocked to 500Mhz in mine for example, that was replaced by a 700Mhz Athlon Slot A chip, that was a heck of an upgrade aswell, the first Athlon felt hugely powerful compared to all that went before.