NO MATTER what I or anyone on here tells you, get the 1 that fits YOU. Go to a range and try out different guns, take a firearms training class, decide exactly what features you want, and get 1 YOU are comfortable with. Sure I could tell you what I think is best all day long, same as all the other replies, but the fact remains we've never met you, don't know what hand size/strength you have, whether you're right or left handed, etc., so WE cannot pick a handgun for YOU. The idea is to keep it as simple as possible so you won't be confused at that critical time. Training & proper practice will be the best money you'll spend. Don't forget to set aside money for holsters, ammo, training course, cleaning kit, etc.

Choose the handgun that feels the most natural, including exterior controls, if any. Make SURE handgun is unloaded, look at something, raise gun quickly, see how close the sites are aligned to your point of aim,repeat several times. Only then will you really have an idea if it fits or not, still to be determined by actual shooting if possible.