IronMan Sprocket by Dirt tricks. Super lightweight steel design. Wears like steel...because it is steel.
On chains, the non O-ring chains all wear and stretch rapidly. If you are looking for longevity, go with a D.I.D o-ring style chain.
The 520 VM or the 520 VT2.
"Make a man a fire and he'll be warm for a day.
Light a man on fire and he'll be warm for the rest of his life."