Don't let being completely "ambidextrous" make or break a deal.
A Ruger P95 is ambidextrous for the both the magazine release and the safety. The slide release being ambidextrous is quite rare, actually, and not needed to manipulate under pressure.
The Ruger is an exceptional value, and its size is just fine for OC. I don't think you can go wrong with this choice if it is on your list.
You can also find used Beretta M92's, M96's, S&W 5906's, etc for around $350, not much more than a Ruger P95. A Sig P6 (P225) can be gotten for less than $400.
Where in AZ are you? We might be able to recommend a good shop where you can check out some good deals. J&G Sales in Prescott will have some surplus stuff for decent deals.