for me, Keirin frames are just about the only frames floating around that meet my criteria... steel, hot lugs, short top tubes, come in small sizes, tight geometry, amazingly well built, have a story behind them, and have little superstrong elephants on the seat tube. (ok, it's all about the elephant)

and then i just feel like frames deserve the parts the builder envisioned... the same reason that if i had an italian bike i'd build it with campy.