Stay and take the gamble bmibus. The airline will soon be in different hands due to the exit of Mr Bishop and then things could change quickly. My money is on the Lufthansa people as they've already got a jackboot in the door. There's really not much better out there at the moment due to the uncertainty in the world (high oil price, middle east uncertainties plus open-skies looming for LHR etc.)
Best of luck,
The Count