For $2000 on today's market, you should be able to buy a complete, original M1911A1 in 95% or better condition. Remington Rands, Colts and Ithacas will fall into this price range in that condition. A US&S will be a bit more, or have a bit more wear on the finish to make this price point. In five years, they will all cost more. Do not plan on them going back down in price, ever. The problem is, you can also spend $2000 on a mix master worth $500. You must educate yourself before you put your money down. The seller may or may not know you are getting a bad deal. The quality of your deal is in your hands.
What I would recommend is getting in touch with a few veterans groups. Let it be known you are interested in a real WWII vintage pistol. Let it be known you will pay a vet's widow or children
what the pistol is worth on the retail market if and when she or they are ready to sell. Remain nice, discreet, and you will soon have offers to choose from. That way, you can know the pistol's history, and can become a conservator of history. If you can, help a widow, rather than let her be taken advantage of. Most unknowledgeable family members will let these pistols go for between $500 and $1000. Don't do that. Give them what the gun is worth.
You can also let gun dealers know you have cash to pay a market price without a lot of hemming and hawing. These pistols still walk into gun shows and gun stores in the hands of family members wanting to liquidate them. They usually go straight into the shop owner's personal collection, or a phone call is made and the pistol is gone in under an hour. Collectors leave business cards and let the shop owners know they have cash to spend on the right gun.
Here's how I finally found mine.
In the meantime, while you wait on your deal, educate your eye. Make certain you will not be taken for a ride. Handle and inspect a lot of M1911A1s. Hold them in your hands. Read up on them. Study them. Talk to a lot of guys like John Holbrook, Old Fuff, and 1911Tuner. In this market, you can only trust your own knowledge. Unless the seller is a collector of the caliber of John Holbrook or Jim Supica, they can also be mislead, and truely believe they have something they do not.
FWIW, ulflyer is undoubtedly right concerning the M1911A1 in that auction. It has been refinished. I will not say just how I know this. I promised the man who told me how to spot a refinished RR I would not divulge the manner a refinish is quickly spotted on that particular gun. If forgers knew, collectors would suffer. I will, however, state whether a RR is likely a refinish based on this criteria that is specific collector type knowledge, and that one is a refinished gun. The seller himself may have been duped though, so you can't go making waves. Just take a look and move on if you don't like the looks of things.
Good luck in your search. I hope you find a good one!
Would you believe some were going for as little as $17.00! 
