Intel Celeron 266
I have three Celeron 266's: this SL2SY, a boxed SL2YN and a CPU only SL2YN. The SL2SY is the OEM-version and didn't come with Intel's shroud-cooling solution.
Somehow I've liked the first Celeron's for it's box-art and the way the boxed cooler looks. However, performance was sub-par due the lack of L2-cache. Luckily 'Covington' was quickly succeeded by 'Mendocino' which was basically the same CPU but with 128KB on-die full speed L2-cache. Those CPU's performed very well and were also quite overclockable.