The Taig mills we sell work well on metals and, to a lesser extent, wood. A machine meant to cut metal generally can also cut wood; the reverse is not usually true.They aren't large, so one won't take up much space, and they aren't too heavy to move around. If the work envelope is suitable for your projects, it would be a good choice. The price is quite reasonable for a machine made in America, that comes with a guarantee and support. Plus, we offer a discount.
Acrylic is another matter, as is stone. Acrylic has a nasty habit of melting and building up on the cutting tool, which eventually starts to mar the work or break the tool. If you want to cut it, a laser works better than a rotary tool. If you want to make carvings in a transparent plastic, polycarbonate works a lot better.
Cutting stone requires a machine that's protected against the abrasive slurry that the process generates, which will otherwise destroy the screws and sliding parts of your machine. It's also extremely slow in all but the softest stones. If you just want to do lettering or something essentially 2D on the stone surface, you'd be better off masking it off and cutting a stencil, then using abrasive blasting to carve your design.