After looking at my book, here's the way I'd rule it:
1> Movement effects involve teleportation - the target disappears at one point and re-appears at another without crossing the intervening distance. Movement effects that provide extra actions do not involve teleportation, obviously.
2> The correct DC for a minor movement effect is 15.
Now, that said, you could probably introduce this variant:
Movement effects with a range of close can have a Casting DC of 5, if the target actually crosses the intervening space. So, if your target is basically thrown 25' by a movement effect, but is not teleported, then the DC would be 5.
Characters moved by chaos magic should not incur attacks of opportunity as a result of the spell and will stop if they are moved into a square that contains another creature or their path is blocked.
That's just off the cuff, but it should work with a little adjustment.