When you say unabridged, do you mean a version that has the complete text for each of the heavenly realms mentioned at the end? The wiki link above seems to have them, but I suspect this is from the SLTP (Sri Lanka Tipitaka Project) version of the BJT(Buddha Jayanti edition) which is notorious for its typos. Don't know if they have been corrected on the wiki.
The most recent link above seems to have the text for the heavenly realms elided. Are you planning on chanting this with a group? Some traditions (I think Thai) chants with the text elided. Others chant it completely (I think Sri Lankan).
In terms of lack of typos and having the repetitions, I would recommendhttp://www.ancient-buddhist-texts.net/T ... suttam.htm
by Bhante Anandajoti. You should note, though that this is the version found in the Vinaya, not in the SN like the links above, therefore it does not have the evam me sutam. If you find his texts helpful, be sure to drop him an e-mail.
This is a link to the pdf version of the "pocket" chanting book used by monks in the Ajahn Cha tradition:http://www.what-buddha-taught.net/Artic ... Chants.pdf
This sutta is on page 82. Even though it is not designed well for printing as a booklet, each page is rather bite-sized so might be good for always having a page in your pocket.
Best wishes for your memorization.