The spiral stuff is OK for derailleurs, but if you start having shifting troubles, look there first.

If you are having trouble with wire creep on compressionless housing, here is a tip: bend the housing into the desired bend BEFORE cutting it. Since the wires on the 'outside' of the bend have to cover more distance than the ones on the 'inside' of the bend, if you cut the housing square while it is straight, it will end up angled once bent, and it won't fit flush against the base of the metal ferrules, which can cause wire creeping. If you bend it first, and THEN cut it square, you are better off.

peace,
sam