i got R10 now, started 1 week ago, I just did 9 dungeons on HM (all the same over and over) and then turn in the boo kfor 16,5K rep points. its really easy and fast! and you get some sweet drops at it
Shards Of Orr
Oola's Lab
Ooze Pit
Secret Lair Of The Snowman
Katacombs of Kathandrax
Fronis Ironfist (i think its called that)
Raven's Point
Bogroot Growts
another way is just speedbooking, did that also but that was boring as hell and no good drops... took me 10 min for 3K rep points with speedbook.
(just to let you know, i got from chests 1 Q10 eaglecrest axe, 3 gold polymock pieces and 1 Q11 storm daggers

rest was all crap)