I am absolutely a rabid, senseless fan of HK, BUT the thought of a DAO USP is pretty scary. Don't get me wrong, the DA trigger on my USP isn't THAT bad (especially considering it's function), but if it were every shot, I'm not sure it would be such a fun shooter.
If I had a G23, I wouldn't think twice about a USPc .40 DAO and just be happy with the Glock.
USPc .40 DA/SA? USP in a heartbeat... that is how much the DAO trigger would bother me...
Also, if it were the new Law Enforcement (LEM?) trigger on the DAO HK, chalk another up for the USP. Heard very good things about that trigger... While I like my Glock, I like my HK better.
IMHO the DAO USP would be the pitski...