There are many different alloys of aluminum to use depending on your
application and manufacturing techniques.
6061 and 6063 are a couple easily obtainable and easy to work with
alloys, they can be welded, machined and anodize well. You will
probably be able to find wire in these alloys but not a large
variety of sizes. As aluminum is generally rather soft it is easy,
after annealing, to draw the size wire you need.
the 1100 series are soft, almost pure aluminum, weld and solder
well, also cast well and anodize very cleanly.
5000 series aluminum is a good relatively strong alloy that can be
welded, anodized but hard to find in anything but sheet.
The 7000 series are probably the toughest alloys, often used in high
strength and higher heat parts. These are hard to work with.
There are a number of casting alloys like 1100, 356 and “Almag” that
cast well and anodize very well.
There are many links to explanations of aluminum alloys on the web.
I made anodized, cast and fabricated, aluminum jewelry for a number
of years and had no problem with it being too soft, it is not as
strong as silver or gold so you have to design accordingly.