There are lots of things to consider when buying a new pistol.
Since you've decided that you want it for target practice, caliber isn't as important unless you're using it for competition. The lower caliber ammo obviously costs less than the higher. My 9mm ammo is half the price of my .45. I shoot at least 200 rounds at the range, at least once a week, usually more. That's over $50 for .45.
That being said, I enjoy my .45 far more than my 9mm. I find them more fun to shoot and more accurate. If you don't mind the extra cost, or if you plan to reload, get the .45. Specifically, get the P220 or a 1911, in that order. Ruger also makes a decent pistol, but I prefer Sig Sauer.
Strangely enough, I don't own a Sig Sauer 9mm. I wasn't sure if I'd like 9mm so I went out and bought a new (inexpensive) S & W SW9VE. The trigger was really hard until I broke it in, but now I don't mind it. I'd get one again since they are so inexpensive, but my first choice would definitely by Sig.
The caliber has a lot to do with the recoil, but it's not the only thing. My Sig recoils less than my S&W. Why? Because it's heavier, the barrel is longer, and the rails are full length. The rails on a Sig go the full length of the frame. That results in a smoother, more accurate pistol.
So, when you go pistol shopping, remember: The best pistol I've ever carried is the Sig Sauer P220. Two Tone is pretty sharp, but you can get it blued or in stainless.