Monks can make it to 60 solo quite easily.
SolB and HighKeep are your go-to spots.
SolB bats are excellent experience until 53. LDCs will take you to 60. There's a bit of a difficulty gap from 53 to 56, but HHK nobles do well for that. On live, I did 4.5 yellows of 59 in one 15 hour sitting on a monk doing LDCs in Velious. LDCs are relatively weak for their level as are HHK nobles (rogues). Nobles start to go light blue around 54 (they range from 39 to 44), but the ZEM makes them worth it until they completely light blue out. At that point, LDCs become worth it.
Both zones have bandage/general supply/bindable zones nearby.
Enjoy.
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