most of those are 1/4 - 1/2 longer than stock and will give you only a slightly higher ride height, (measured at the rear grab bar)
i know this for fact about the 400ex and 450r. i've had both.
i believe the suzuki's are about the same, not sure about the kawi's ?
the yfz is quite a bit longer and most cut like an inch off the bottom mount, right above the existing hole and drill a new hole up as high as possible, and it will still adds a few inches to the ride height.
the trx250r shock is much longer and added about 6 inches to the ride height on a +4 swinger on my black bike, i moved the mount to make it sit about 2 inches higher, but it is a very good shock