Don't know my averge but normal Halls of Origination is good, 7 bosses at 150 per. Actually one of the few instances that have *gasp* actual tank and spank bosses. Except for that Setesh... oh I hate that guy... or at least his stupid gates. The others are easy though.

And lots of trash in GB, but tougher trash, out of the normal 85 dungeons.

I've just been alternating those two, and killing the only 3 heroic bosses that I have down on a daily basis for rep.