I use Stealth/Sidewinder/Krause Racing rears exclusively, the aluminum over steel. They last for years and years, and with the DID ZVM chain (best chain you can buy), I go years without adjusting chains, 5 tires at least on my Ducati without touching the adjusters, 2 years on my YZ450F without adjusting it, and I've got the same setup on my KTM950, been on there about 6 months or so, no adjustments at all, not even after breaking it in. And I always use stock countershaft sprockets. Its worked for me.
The set up has probably the most expensive chain you can buy, about $215, the sprockets are fairly cheap at $80,but to me, it's worth it. No issues, long life.
Ducati S4 916 is history.
KTM 950 SM, my main squeeze now.
And now, an XR75,