Sounds as if you've already made up your mind and it is only a matter of which 1911 to buy.
I like both 9mm and .45, but I have to agree with the recommendation to start with a 9mm first and make the 1911 your second gun.
Unless you are lucky and have a lot of disposable income, the cost of the .45 will quickly put a break on your shooting and you will feel frustrated. Lot's of guys wind up trading their .45s because of it.
Get yourself a nice Glock 34 with a 5.25" barrel, your love it. Here in texas we have www.texasguntrader.com
and you can easily get 90% of your money back on a G34. YMMV where you are.