From the number of replies already, obviously there are a lot of choices and there is not one gun that is going to be right for everyone. The size of your hands, recoil tolerance and a variety of other things are going to determine what gun is right for you.
I own a gun store & help people find the gun that is right for them all of the time.
My personal recomendation is to first determine what caliber you want. Lots of choices there and there are pros & cons to each. My personal recommendation to most people who are actually going to carry concealed is a 9mm. Reasons being- LOTS of choices of guns in a wide variety of price ranges, sizes, etc; not to get into a 'caliber pi$$ing match' here, but 9mm with quality self defense ammo has plenty of knockdown power; ammo is readily available & is the most inexpensive of the standard carrying calibers; very managable recoil= more enjoyable shooting & quicker/easier target acquisition for follow-up shots. For most people the last 2 mean that they will actually shoot the gun more, which is what you need to do if you're going to be proficient with your gun.
When looking at & handling guns a few other things to keep in mind is whether you want a single or double stack. More rounds with the double stack, but you're going to have more bulk. Also make sure to consider whether you want a gun with a manual safety or not. Some have them, some don't and it's a personal decision as to whether you want your gun to have it or not.
For what it's worth, by far the best selling handgun we have is the Taurus PT111 G2 Millennium. It's a double stack (12 round mag) but it's nearly as bulky as most other double stacks, it has great grips, a manual safety that can easily be disengaged with a swipe of your thumb when drawing as well as a trigger safety, chamber loaded indicator and it is very affordable (we sell it for $269.99). The all black one also has a $50 mail-in rebate through the end of the year. It is an absolutely AWESOME gun, especially for the money.
Other popular models that also make good carry guns would be the S&W Shield, Ruger LC9s, Ruger SR9c (compact- also comes in a .40) and Springfield XDs. We don't sell SCCY, but I've heard decent things about those as well.
It's a big decision, so don't rush into it. Handle and possibly actually shoot as many different ones as you can before purchasing something.