I checked out the Diamond and the Bix's at shot last week, and for a single stage I'd just go Diamond. The two stage Bix Tac Sport was awesome (all the Bix stuff was) and probably where I'm headed.
My biggest concern is how well they deal with dirt, crud and pierced primers. The Bix is pretty closed up and doesn't look like it would flush out well. The Trigger Tech guys said don't even flush their triggers if they get dirt or dust in them. Cycle several times and it'll clean out.
We hit Timney after feeling the Diamond and the Bix. It seemed like they just threw a bunch of their triggers in rifles and never adjusted them to feel good, but I know that can't be the case.