I have the XDS in 9mm and really like it. I originally had the smaller 3 inch barrel but sold it to my brother to buy the 4 inch. At 10 yards or so, the longer sight radius didn't help much, so I prefer the lighter 3 inch more. You can get both for under $400 most times.
I have also looked at getting the LC9s. Great feeling slim gun, smooth lines, well reviewed. And make note that it is the "s" version, which has the improved trigger. It also has a safety, but you can get the Pro model without it. I think they run a littler cheaper at $360ish. The last option I would suggest is the S & W shield. I don't have one, but have shot it and liked it. Many fans of those as well.
Those are just a few popular ones for DAO. Harder to find as many compacts in the SA/DA, they are out there though if that's what you're looking for.