Dear Mark,
it is a good idea to present the results on a group template, either the avg152.nii or a study-specific "template" based on the average of the normalised structural volumes. The latter might provide more anatomical details. single_subj_T1.nii is indeed based on a single subject scanned several times, also known as colin-27 template.
For more information on the templates provided within SPM see http://imaging.mrc-cbu.cam.ac.uk/imaging/Templates and http://imaging.mrc-cbu.cam.ac.uk/imaging/MniTalairach This paper http://www.nbrc.ac.in/faculty/pravat/JAD_120412.pdf by Mandal et al. also gives a nice overview.
Best,
Helmut
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