Reeving lines

[seawolf]

Hello all,
I was wondering what kind of line the rigging community usually uses for reeving lines, for removing and replacing halyards?
I have used surveyor's line because it is so cheap, but the stretch worries me when some force is required to get a line through. And the diameter is small and possible to slip off and jam between sheaves Even though excess force required may be the indication of another problem, I would like to have a line I know I can depend on. Also cost is an issue if you are using a few hundred feet of the stuff.
Thanks in advance for any suggestions.
Bob