Hahaha, I got a 512 Meg stick of generic PC2100 for ~$140 and run at 164 FSB with MAX timings at 2.7V!
What are you looking at for $200+? Are you canadian?
Also, if you really wanna overclock why not look into PC2700 or something, that way it won't be out of spec at all even with 166 FSB, it'll be garaunteed to work at that high a speed. And yeah, it'll work on a board that wants PC2100.
--Illah