You can’t go wrong with a Glock or a Sig Sauer. I own two of each. A friend of mine has a HK 9mm and it is also a fine weapon. I would recommend that you buy a 9mm or a 40 caliber if you buy the Glock, Sig or HK since they do not have as much recoil/muzzle flip as a 45 caliber pistol. I also have a S&W 38 Special that is of very high quality and extremely reliable. The advantage of a revolver over a semi-auto pistol is that the revolver is not going to jam whereas if your wrist is not taut when you shoot an auto-pistol, the weapon could jam when it ejects the spent cartridge. This happens every time my wife tries to shoot my Glock 9mm, The Sig 9mm or the Beretta 9mm. We solved the problem by buying her a Beretta 380. The recoil/muzzle flip is reduced on the 380 and her pistol has never jammed. The 380 cartridge does not have as much stopping power as a 9mm but it is very close and will do the job if you ever need it.
I bought several guns from the dealer on Morena when I lived in San Diego. They had competitive prices and were easy to deal with.
Hope this helps.