I would say the P2000, P2000SK, P30SK, and USP Compact (all in
LEM, usually in V1, V2, or V7 variants) are probably the most realistic current production compact guns with some form of a DAO trigger. LEM is not a true DAO but, it sort of mimics it. It's a love it or hate it trigger system for a lot of people, though, so I'd see if you can try one out locally first. One thing to watch out for, though, is a few of the models like the P2K and USP Compact did briefly come in a true DAO variant. I might be off but, I believe this was around the end of the 90's to the early 2000's, possibly mid 2000's. That true DAO is not the one you want as it's a heavier trigger that isn't great. If you buy something recent production or new, you'll be fine. I'd just pay more attention if you find something used, much older production, and getting close to ~20y/o. If browsing used guns, take note of the
date codes on the frame or slide to figure out production year.
The
Px4 series are also decent. I believe the
Type-D (DAO) variant only came in the Full Size. However, the Compact or Compact Carry can be converted to DAO by removing several components, similar to how you would on a 90-series. Doing this conversion may be more work than you want but, I bring it up since
LTT offers tuned Px4's as well as red dot mounting options. If you don't mind the full size, you can occasionally find the Type-D model (visible by no safety levers on the slide) on Gunbroker. They're a bit tough to find but, I usually see a few listed there every other month.
If you don't mind an out of production option that's still plentiful, the
P250 still has a lot of attractive qualities. Obviously the numerous sizes and frame options are one of the nice features. The trigger might be heavier than some like if they're used to a light SA or striker pull of ~5.5# or less. Anyone with any real time on a revolver shouldn't have an issue with them though. One of the nice things about the P250 series is, despite being out of production for a few years, a number of components are shared with the P320 series, including magazines. So they should remain viable for many, many more years. Some parts supply is drying up a bit for them though, so if going with one of these, I'd stock up on some spare parts to be safe. I really regret not snatching up a dozen or more of these when Cabela's had a blowout on them years ago for something like $200-250 a piece.
If you don't mind the weight and prefer a metal-framed DAO, beyond the SIG DAK's others have mentioned, just about any Beretta 90-series is always an option. For carry, I'd probably opt for something like a 92 Compact. For DAO, there is the
92D / 96D (and
Centurion versions),
92D-XR (rare), and possibly some rare models I'm forgetting. The D models are getting harder and harder to find but, nearly any 90-series can easily be
converted to DAO by removal of a few components. If it was me and I was going the 92 route, I'd probably get something like a 92 Compact non-rail frame, convert it to DAO, add
Langdon's TJIB, and call it a day. In a more perfect world, for me it might be a
92D Compact Type M but, I wouldn't have the heart to carry a $2-3K rare gun like that.
Bottom line, most of your options will probably be Beretta, HK, or SIG if looking for current or recent production options. Others exist but, you don't hear about them as much on PF, or else you do but they're long since out of production (e.g. S&W third gen autos or older).