It seems to me that most smart webmasters prefer 7.5 or 7.6 for many reasons. If possible, it's prolly a good idea to do some research before just installing one of these versions of nuke because you may be sorry in the long run.

Here's a good article on why you should forget 7.7 and 7.8: http://64bit.us/article83.html

or simply go here: http://ravenphpscripts.com/forums.html

and look through the forums.