Great Plan! Best of luck. I have visited that place in 2005. Don't forget to keep good camera with U :P.
In 2005 the charges for Jeep rent was 4000 Rs. Aqeeb bhai is right. they made this road by hand with no monetary support from govt that y charging much high or even if you want to take your own ride. On our visit in 2005 one local boy told me; way back in 70s there used to be a carpeted road till fairy meadows. Don't know its true or not!