If you go with a mitresaw, use a triple chip grind 80 tooth blade. I use one on my table saw and my sliding compound mitresaw. I get very accurate cuts with very little teeth marks on the end (In fact, a light filing and a maroon scotchbrite pad will give you a nice matte finish. For light steel, I use a metal chopsaw with a 14" abrasion wheel. I can cut 45 degree angles on that set up as well. If you have to cut thick steel, use a band saw with a lubricant.
Note: I'm a carpenter by trade, not a machinist. My tool choices reflect the view point of a carpenter. If I were a machinist, I would buy a bandsaw because I can use it in a machine shop
-Patrick
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measure twice, cut once - a good rule for everything