For a first pistol? I'm currently shopping and well, I'm a big fan of 1911's. They're more readily available in .45 than they are 9mm.
I would say, generally speaking, your first rifle or handgun should always be a .22 - can't beat them for how much more shooting you can do for the same amount of money, working on shooting form without the additional distraction of more noise and recoil, etc. And if you like 1911's, you can certainly get 1911 family .22s.
There may be more models to choose from in .45 ACP than in 9mm, but 9mm 1911s are not a rarity either. If you compare purely on the basis of dollars, you can probably find a .45 ACP 1911 for less expense than a 9mm 1911. On the other hand, the difference in the price of ammunition will eat that up pretty fast as well. Particularly if you don't reload. So you can choose to take the hit in cost at the front while buying, or every trip to the range after that. And the more you shoot, the more you're going to be penalized for the caliber difference on every trip to the range. If you were asking me, I'd say buy a quality 9mm and be done with it. By way of example only, Firearms Outlet in Ontario will sell you a Rock Island Armory Tactical in 9mm for about $900... not too bad at all if you're pinching pennies.
The recoil of a .45 ACP is nothing to cry about and I'm not sure why it got a reputation for recoil - it just moves around in the hand more. But less recoil is always more pleasant to shoot. Personally, unless you have a special love for the caliber or shoot Bullseye where the bigger caliber gives you a better chance of picking up a few extra points with biters, I don't really know a good reason for shooting 45 ACP instead of 9mm. However, most firearm purchases are probably based more on emotional appeal than logic anyways, no matter whether you're talking handguns, rifles, or shotguns.
The other thing you can also do is add a .22 conversion kit to the top end of your 1911. They range from fairly inexpensive to very expensive competition accuracy grade. Then you've got two guns and calibers with the same grip and trigger on both of them.