Aye that bit wasn't a problem. Didn't know about the slash commands but I just edited the LUA to "HonorBar_Default = { max = 75000,".
However I'm constantly grinding reps and like to keep a track of them also. Any suggestions as to how to make it an extra bar, rather then a replacement?
Edit: Uh oh. It doesn't actually seem to work while level 80. It puts the bar where the rep bar would be as if you still had an XP bar, making it impossible to see.
http://a.imageshack.us/img408/3595/63850203.png