all i know about dmt is that it lasts like 20 minutes or less and everybody i know that has done it has pretty much had a "spiritual trip"
saying that, it seems pretty intense, i would probably recommend acid/lsd if your looking for opening up your mind. Your completely conscious throughout your lsd trip and your thoughts can be controlled, i've got the impression from friends that on dmt you kind of just conk out and trip then you come back to sanity.
and.. in saying THAT, lsd/acid isnt really that big of a deal if you only do like 2 hits which is enough for visuals and shit. TV and mainstream make acid sound like you cant control yourself and you'll go on a psychedelic murder rampage.
Watch the ....On Acid series on Vice.tv, it will definitely change your mind about acid.