Maybe it's been posted before, but not too long ago Harbor Freight had on sale a little "Mini cut-off saw". THis is like the cutoff saws used in metal working, and something like the miter saws used by carpenters. Very thin, fine tooth blade, but the blades are pricey, by their standards anyhow.
I've been playing with it, and have found that for wood, aluminum, brass, it's beautiful. Cutting the K&S brass angles, accurately, cleanly and fast, it's great. No distortion even when cutting 1/16" tubing, even the 3/16" X 3/8" rectangular tubing cuts nicely. Regular price is $29.95, but I'd wait until it's on sale, $19.95 sounds so much better.
The blade turns some 7800 RPM, don't even think about putting it down on steel, the blade will be gone instantly, and they're in packs of three for $10. I don't think I'd try NS track either, nickel silver is another name for stainless steel, and it's even nastier when the blade speeds are high.