Yes, yes. I don't think our advice disagrees with each other, but one is just slightly more advanced and learned than the other (uhh, that'd be your advice; mine is more "filmmaking for dummies").
Also, I should clarify, that when I said you don't need a Z-finder or monitor, well, that's only if you don't plan on doing a bunch of follow-focusing (or rack-focusing). For either of those, the on-cam viewscreen won't do the trick (I've tried), and since the T2i won't monitor in HD, I'd think Z-finder is the best tool (though, to be honest, that's a guess -- I've never seen or used the T2i with any kind of monitor).