+ 1 KMC Kool. They make a lite version as well. Back in the day, a lot of things were overbuilt so on a lot of single speed bikes you would see these huge 1/4" chains that were indeed indestructible but were just way too heavy and ridiculous (I think the chain weighed 3 lbs). Eventually, KMC came out with the kool chain which was just as strong but without all of the weight. Since the design has still stuck around and is selling well, I would assume that it's still up there amongst the rest for a good ratio between strength/weight.

However, I would wait a little while for a few other opinions as some manufacturers make chains specifcially designed for fixed gear riding.
Izumi comes to mind. These chains are probably better designed to handle the torque of a fixed drivetrain while being light enough to race, and a little more attention may be put towards making the drivetrain smooth.
For whatever reason, when you start shifting into the race/road world things start to get ridiculously (and in my opinion unnecessarily) expensive.
There might exist a chain that is priced well and has ALL of the above qualities.