You have some high expectations on those features. I don't understand specifying .40 cal vs. .45 ACP. This stipulation will greatly limit your choices and add a premium to the cost. Additionally, you are simply not going to find a 1911 that disassembles and reassembles as easy as your Bersa. Take down levers and spring bushings are simply a part of 1911 ownership. You are probably on the right track looking at STI but their lower cost models all disassemble like a standard 1911.