My personal advice is that if you want a WWII vintage 1911, get one but get a modern GI for shooting.
Finding a USGI anything is getting harder and harder to do, and the prices are climbing. They make for great investment pieces etc. but every time you shoot it you're depreciating it's value.
I saw somewhere that Ithaca who make 1911s during WWII is getting back into the 1911 game and has a WWII Replica model coming out, I think I'll pick one of those to go with my 1944 USGI.
There are many good makers of "GI" style" 1911 pattern pistols out there such as ArmsCorps / Rock Island, Auto Ordnance, Springfield, and now even Para Ordnance. The Para Ordnance GI model has been getting great reviews and is now even available in stainless.