At 70hrs P1 I would suggest a twin is to much of a handful for you to consider you are still VERY green in flying terms.
Get some time under your belt, hone your navigation, get some complex time in something like an arrow and then consider MEP.
You will also struggle to get anyone to rent you anything with such low hours.
The comments about the Navajo are correct, I fly one that belongs to a friend and you are looking at around £800 per hour in operating costs.
I had nearly 2000 hrs and IR when I started to flying it and found it a handful for the first 20 or so hours.