I've only ran a couple 2.0's so my knowledge of them aren't very expanded. Usually just grab some Logitechs and call it a day. But lately we had "someone" (protecting the guilty) hook up some 2.1's wrong for a long time, frying the amp, and me looking for 2.0's that you can't really screw up. Grabbed the GigaWorks-T20
and think they're pretty darn good...more than I expected anyway. They sound pretty good up to 3/4 volume and then they kinda crap the bed, but that's good for what we intended.
The last were Logitech Z-2xxx (can't remember, but they claimed to be THX) and think these sound a bit better, minus the woofer of course.