Well money wise. I would do laws from 54-91 now, or if astrals are around the 160-170ea markish I would double up on them at 82 to 91. Natures aren't that good profit becoming even under 100k per 1k now for non 91 rcers. If your going for exp mostly. I would suggest Graahks from 44-75 rc. However in saying that it's not the fastest method either, just the most optimal choice. If your willing to blow several mill and have the requirements to do it effciently. Make lava runes, as their the fastest rc exp in the game. Lava runes are a major hassle though. Once your 75 rc I would suggest zmi to 91.