Dweste asked a similar question about tool kit for his boat.
You have to look at what tools you are likely to use in both his case and yours.
With a land kit you need to look at multiple use more while on a boat you can inventory every piece of machinery and each material and have the tools specific to it.
Also on land you have better opportunities to get a specific tool if you need it.
You will have access to garages, machinery shops and hardware stores, even if they are pretty much rubble.
So for working wire a good pair of end nippers or lineman's (electrician's) pliers.
Something to smash and bash with? A 16oz carpenter's hammer.

But again this all depends on what it weighs and what kind of an area you will be in. It also depends on what other equipment you have.
For example, if you wear eyeglasses you need at least one spare pair plus a repair kit. Luckily the kit for glasses is very small and light.
On the other hand a sledge hammer or fireman's axe would be nice for going through doors, but it weighs about 10lbs, is not likely to get used, is an awkward size to carry and there will likely be other ways of doing the same thing.
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An aside, you do have safety glasses don't you? If not get some. If you need prescription get a pair of safety glasses in prescription and add a set of goggles that fit over them into your kit too. You don't want to get blinded when you are in a crisis.
Throw in a pair of work gloves too, no sense dying from an infected scratch.)
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There was a thread here about a household toolkit that might help.
http://forums.equipped.org/ubbthreads.php?ubb=showflat&Main=12656&Number=161975#Post161946

If you enter "tools" in the forum's search box you might get a few other useful threads too.