KMC Z610HX (silver, bushingless); made specially for single-speed drivetrains - $15.00
Is probably the toughest 3/32 single speed chain. I got mine from
http://businesscycles.com/trcomp.htm#chains.
Keep in mind that bad chainline and bad lube will brake any chain eventually.
I use phil wood tenacious oil as chain lube. I ended up with this after trying almost everything else and against advice from many other people. I believe it is the best, but chainlube is almost as personal as saddle choice. Also, I do not recommend Surly cogs. The EAI steel ones are what I use.
I even notice a switch of one tooth in the chainring. 47 ring feels harder than 46 ring. Nnot much but definitely noticeable. Currently I am riding 46x18 and it feels perfect to me.