Yeah, I'm trying to avoid nuisance tripping with arc fault breakers for sure. I built a house just prior to requiring them (our locality hadn't adopted code version that required arc fault) but other localities had adopted and there were lots of horror stories. How many were faulty installs?? Hard to say. Either way, detached garage shouldn't require them with no kitchen or sleeping quarters, so I'm not putting them in.
I should have been more clear in what I'm hunting for, I have a QO load center, and it's got a "plug-on neutral" (breaker can actually snap onto a neutral bus, so no pigtail to "normal" neutral bus). Little gimmicky, but if I can, I'll buy the breaker to take advantage. I can find combo arc/ground fault breakers with the plug-on neutral, but not GFCI only.