The new job.
The fourth was doing work that required negotiation, strategic thinking with lots of deadlines and would need me to work fast, hard and require every bit of intellect I could put into it. It was a grade higher than the other jobs, but not enough money to sway me. It was also an 18 month secondment - and really only an 18 month secondment as the position had only been created as a temporary position. It lacked the security of the other jobs but the work, the work was exactly what I felt I needed to be doing.
I took it. and nearly 5 months on it has been the best move so far. Don't know what the future holds, but I am unconcerned. The work is valued and I get to make a contribution that I can see having an impact.
Can't ask more than that I reckon.