XDs .45
I researched for a few weeks looking for just the requirements you were looking for and I settled on the Springfield XDs 3.3 .45 ACP. For concealed carry it's perfect, with the 5 round mag. And shoots Very, Very well! I have read where some say the grip is a bit small in this configuration, and my first few shots I thought so to and bought a Pearce Grip Extension. This is a small mag base that extends about 1/2 inch to let your baby finger get a better grip, I then shot and the grip is perfect. There are also 7 round mags that will give you a grip just as good as a full size, for at the range and home defense. I have owned it just a bit over 3 weeks and have become accustomed to the 5 round mag without the extension, and have found that this is the best shooting handgun I own, or have ever shot. I'm 100% satisfied with the XDs 3.3, there is also an XDs 4.0 out with a 4 inch barrel. And a 6 round mag is soon to be available. Check this handgun out and I'm sure you will find what you are looking for all for less than $600.