I disagree about getting rid of the paracord. Though it is not as environmentally friendly as natural twine, it is more consistent and reliable. Perhaps you have room for both.

For cord and wire, carry as much as you can. I keep at least 90m in my car kits. 30m is a good start for a kit, but if you can fit more, get more. I've been experimenting with cutting it into lengths of approximately 8m, to make it more managable. So far that is working for me.

It depends on whether you expect to use your kit in a wilderness situation or urban or both. I think duct tape would have less applications in the wilderness than it would in an urban setting...mainly repairing gear you carry, whereas wire and cord would have more uses in the wild. Not to say that you can't use these items in either setting of course.

In the end, I find myself agreeing with ironraven...if you have room, pack more <img src="/images/graemlins/grin.gif" alt="" />