I agree it's a good option, consider the different trigger types too. The small pocket ones are usually a slide and press, with a few flip top and press options as well.
If you ever have to spray it at someone or something, remember to move, if they don't stop immediately pretty good chance they're going to be upset and moving towards wherever they saw you last.
And, I would recommend finding some sort of professional instruction for this, it's a good idea to have been exposed to OC yourself. If you happen to catch some of it yourself and don't know how to react or what to expect it'll be a bad time.