It shoots when you pull the trigger and doesn't when you don't. Doesn't rust. Not very heavy. List $707 not cheap either, but nothing is perfect.
There are always debates about what is better, revolver or pistol. The plus for the revolver is it is somewhat simpler to use and check to see if it is loaded. However, the self-loading pistol may well have a higher degree of practical accuracy, by virtue of having a lighter trigger pull (~5 lb versus about 12 lb).
If it is a revolver, buy one that will fit the hand. Be sure to buy one chambered for .357 Magnum. It is also possible to shoot .38 Special loads for practice and familiarization. My advice is to do some practice with .357 loads, also. This is so the increased recoil and noise will not be a complete surprise. Some of my recommendations are the Ruger SP101 and GP100 guns, as well as those by Smith & Wesson. Taurus also makes several good models.
On self-loading pistols, I recommend both the .40 S&W and the 9mm cartridge. If you shoot accurately, both will do the job. I have a preference for the Glock full size models, the Glock 17 in 9mm and the Glock 22 in .40 S&W. The Browning Hi-Power is also available in those calibers, as well as firearms from Beretta, Springfield Armory, and other manufacturers.
Don't base the purchase on just purchase price, buy a firearm that has a really good reputation for reliability. Remember, if the SHTF, you want something that will go bang! every time you squeeze the trigger.
It shoots when you pull the trigger and doesn't when you don't. Doesn't rust. Not very heavy. List $707 not cheap either, but nothing is perfect.