Stick with the Government model, they are by far the most reliable of the Metro Arms 1911's offered. I'm not saying that the Commander and Amigo models are bad, but from the research I have done the Government models have almost no negative reveiws, while the shorter ones seem to definately be more of a gamble.
I owned one of the first 1,000 Government models made for a few years, and it was amazing in all aspects. It was reliable (never a malfunction of any kind in over 1,200 rounds), accurate, had the smoothest slide action I have ever felt on a 1911 (felt like it rode on ball berrings), had beautiful blueing, and I really liked that a 1911 in that price range had a forged slide.
I ended up trading mine as I was never going to carry an all steel full size 1911 because of the weight, and also I got a georgous customized Browning Hi Power in trade. But never the less it was an awesome 1911, and at one point I even elected to keep it over a perfectly reliable Springfeild Armory Loaded model because of the way it ran.
Good luck, and obviously I am fully endorsing the Government model if you did not catch that! LOL!