Selecting a Revolver:
The quick answer is any one will do just fine. A better answer contains a list of features to consider.
Size matters. A revolver can come in many sizes, from one small enough to double as a belt buckle (Charter Arms) to one large enough to double as a sledge hammer (Freedom Arms). Both extremes are more difficult to shoot accurately but serve their intended purpose.
You need to select a revolver that has a frame the will fit your grip. Now this doesn't need to be a perfect fit because you can change grips, wear gloves and cut and file on parts to make the fit better.
Once you've narrowed down the frame size consider barrel length. Long barrel 8 inches or more are great for hunting or other long range activities. Barrel that are very short say 2 inches are great for carrying purposes. Some sports define a maximum barrel length (IDPA 4 inches). The longer barrels offer a longer sight radius and are easier to shoot at distances. The shorter barrels are easier to maneuver and move from target to target.
Revolver calibers range from .17 HRM to the .500 S&W. The smaller calibers are more economical to shoot. Current prices for 500 22 long rifle at at ($6-$7 per 100 rounds) and Winchester 9 mm ($100 per 500 rounds). These prices are as of when I'm writing this so do some searching on your own.
The most popular caliber for reloading die sales used to be 38 Special/ 357 magnum. The reloading dies can be used for both calibers. I'm not sure that caliber is still on the top of the list. The 9 mm has been adopted by law enforcement agencies and has become very popular.
"Only accurate guns are interesting guns" by Townsend Whelen. In the long run you will enjoy shooting your more accurate revolvers and you will probably get rid of your not so accurate revolvers. Some calibers and revolver combinations are designed to be more accurate than others. Most calibers can be made to be accurate but some are a lot of work.
If you intend to shoot falling plates, bowling pins or compete in matches hosted by IDPA, USPSA or ICORE, you'll need to consider something called power factor. Power factor is bullet weight in grains times muzzle velocity in feet per second divided by 1000. Different matches give different scoring (more favorable) to higher power factor cartridges. It's impossible to knock down bowling pins or steel with 22 long rifle. And 44 Magnum is too much of a cartridge for an ICORE stage.
Reloading a revolver can be accomplished by several methods.
1. By inserting a fresh cartridge in each empty chamber one at a time.
2. By using a speed loader that holds all the cartridges for an empty cylinder.
3. By using a full moon clip again holding all the cartridges for an empty cylinder.
Different revolvers are designed to accept rounds from these three different reloading methods. Some revolvers are designed to be incompatible with some of the methods. For instance the S&W 626 needs to use moon clips for reloading. You can put the rounds in one at a time and fire them but the extractor will not extract the fired rounds. And the S&W 585 is not designed to use moon clips.
A revolver selected for personal protection would probably have a shorter barrel. While one used for hunting would probably be a larger caliber with a longer barrel.
New or Used: