Leavenworth, no better reason to buy a handgun then the fact that you can. Doesn't have to make any sense. Just look at all the junk we buy and don't really even need. Life is too short, so just bite the bullet and buy one already.
Now if you are unsure of the type and calibre, you could hedge your bets by choosing either .22lr which is the most common calibre and it is the one with the lowest recoil. Even Walmart sells .22lrs because they don't see them as a handgun round. Or the next most popular, the 9mm. I can tell you that I might not find any .38 specials at the 3 Canadian Tire stores near my house but I can always find 9mm. Saves you a lot of stress and frustration if you are going to the range and you have to quickly running into town before hand because you realize that you are out of ammo. Try finding 7.62x25 last minute... I don't think so. And BTW .22 and 9mm are the cheapest ammo (in that order).
As for revolver vs pistol... Personal choice. Go out with a friend who has both and decide which one you like. Revolvers in general are a little more expensive than pistol because they are a little more expensive to make and for many shooters, they are a bit antiquated. Personally, I see value in revolvers but that is just me. As for pistols, you could get great deal on used if you know what you are looking for or looking at but if you are unsure, you could always buy new. With a new pistol, you have more of a chance in avoiding a problem pistol that the previous owner is trying to pawn off on an unsuspecting noob. New pistols don't have to be expensive either.
Gun snobs are going to jump on my case for saying this but if you truly have a tight budget or you don't want to invest a lot of money into a firearm then you should look at a company such as Norinco. Norinco has brand new .22 pistols that start at $200. I have a few Norinco products and I am presently surprized. For example, I bought a two tone NP34 which is a Sig p228 clone from SFRC for $279... That's with free delivery and taxes in, during one of their monthly 18% off sales and even though it's finish is a little rough, it kept up with my real $1000 Sig p228 bullet for bullet. I was so impressed with the value vs performance of the gun that, it is the pistol I take out most often to the range. To give you an idea of much I like that particular gun, the gun that I normally take to the range is my $1800 Wilson Combat 92fs. It's much more accurate than the np34 but it didn't cost $279!
So there you go. Haters may hate my Norinco suggestion but if it gets a gun in your hands and you begin shooting resonsibly than I have done my job. And it is really a great alternative to your Glocks, Sigs, Colts, etc. Don't worry what other people say or thing, just look at your situation, do your research and look at your budget and if you are the type who still thinks you don't need a handgun than you might be the type who might never want to know how to change your own engine oil or understand where your food comes from which is ok too because some people just don't want to know but I believe you do. Why else would you be asking.