Bolt cutters would be quick, but leave sharp ends, which might need to be
ground down for safety/aesthetic reasons.

Forget the sawzall -- you'll go through a bazillion blades (been there/done
that, with rebar). Forget the hacksaw for the same reason.

You can get a metal-cutting blade for a skilsaw. Works well, but makes a
TON of sparks . Probably similar to the angle grinder, which I don't own.

-Tim