By my experience, Rock Islands are fairly solid pistols, but are bested in reliability by Springfield Milspecs. I believe the non-polished feedramp on the RIA has something to do with this.
My only concern about the GI Model Springfields is that the ejection port is not lowered and flared, though I have heard no comments about FTE's with these guns. From the sound of it, they perform just as well as the Milspecs.
For my money, Springfield Armory Milspec 1911A1 is the way to go. A recurring problem I hear about this gun (and one I have experienced firsthand) is that the front sight tends to develop some wiggle after a few hundred shots. I simply soldered mine on and it has since held, but perhaps SA has fixed this error. Other than that, the gun drives tacks, forget what those guys at Guns and Ammo say. As a joke, I took aim at a golf ball I had suspended at 50 yds for my AR, and obliterated it on the first try! YMMV, but for the price I paid, it is MORE than worth every penny.
ETA: Don't make the all-too-common mistake of skimping on magazines. Get Wilson-Rogers, CMC PowerMag, or if you really want to stretch your dollars, MetalForm magazines. I think the Springfield pistols come with a coupon for magazines, which I believe are MetalForm mags, someone correct me if I'm wrong.