i've been after the same thing for a long time. In my experience, the belts always held ok...it was my tensioner that kept giving up, causing the belt to skip time, and thats it...
I had the spring fail...had the tensioner itself fail once...and had them both fail simultaneously...but that was on an engine that would see 8200 rpm regularly...
but i kept reusing the same belt, as it had zero noticeable damage...and when i built the other engine i kept it non-interference, so worst thing that happened was the engine not starting....i'm also not fully aware of the tensioner brand, as i bought a full kit at the time...then kept replacing the tensioner from only stores like partsgeek.com (was in college, didn't have much money).
so if anything...i would say, especially for higher revs, use only the OE belt and tensioner...you could get away with an aftermarket belt from a name brand i would imagine...but i wouldn't mess around with that tensioner...just by holding it you can tell its a pretty needlessly complicated little bastard.
