You could look for a used 1911a1 and some can be found in newer condition for a used price in the area of $500 of course were talking a 45acp with all the bells and whistles. A used norinco 1911a1 is another good choice too.
Or you have the option of going for a new one and changing the sights to what you want. A lower end no frills springfield armory G.I. model is around $419 and the auto ordnance army 1911a1 is around $391. You also can look at the S.A.M. 1911a1 45acp, the Charles Daly 1911a1 45acp and the Rock Iland Armory 1911a1 45acp too. All of these are in the same price range of $350 to $500 more or less.