I have several Springfield 1911's including a Pro.
I would NOT pick the Professional Model for a "first" 1911- it is a tightly fitted weapon that requires at least a little bit of basic experience in terms of maintenance.
Also there's nothing to DO to it- it's TOO GOOD to change anything, so it takes away one of the joys of 1911 ownership, namely, changing parts and tinkering until it's not working right anymore :)
If it were MY first 1911, I would buy a Springfield Loaded model (or less expensively, a Mil-Spec) and a whole merde-load of ammo (and still have a bunch of cash left over compared to a Pro).
Get familiar with the pistol, learn about the myriad options, and then when the time comes and you can get the most out of it, get the professional, or a Les Baer, Wilson Combat, or other top-line 1911. Because I guarantee one thing, once you have ONE you'll want MORE. :)