I just rebuilt an old Trek 6K with Alivio DRs front and rear and an Alivio crankset with an SRAM 8spd cassette (it was on sale).
Running SRAM twist shifters, I couldn't ask for it to work better thus far banging around town. Quiet, shifts quick enough, and
it was cheap. If I had planned to abuse it offroad often I might have read more, and spent more, but I'm very pleased so far.
It's certainly better than what Trek put on this bike thirteen years ago.