I'm a bit lukewarm to the elf 3G at this point. We've had it about six months and it keeps bouncing around our different rifles but eventually is always replaced by a Geissele.
I like the ELF... but like you mentioned, mine keeps getting bounced around because much like my POF trigger, it's good, but not as good.
OP since you want a single stage, I'd go with the CMC. Any particular reason it has to be 1 stage?