to get the cable to wrap around nicely to internalize your going to need to remove the plastic trim piece around the psp memory card slot. it should come right out when you remove the back cover, this will give the cable room to wrap back and be covered when you put the case back together. Heres a pic for reference to anyon doing this.
EDIT- $101 WITH TAX FROM A LOCAL SHOP ISNT BAD, IT WOULD BE $150 EASY AROUND HERE, BUT iM ORDERING MINE FROM NEWEGG.