Story of Johny Mnemonic in SR, General advice needed Options

[Smirnov]

During the course of the game, our group has got their hands on some nasty bit of paydata (don't ask how, that's some one in a million chance), which costs a 'bit' more than our collective lives. So right now I'm felling myself as probably Johny Mnemonic felt - I have some data which will most certainly kill me, but it's worth a shitload of money. Or probably even f@ckton, even measured by urnbandict standards.
The only question is - what do we do now?

To give some detailes, we got our hands on a novel and quite secret research done by one megacorporation, which would interest at least two (or maybe three) other megacorporations, and as soon as the first mega know that we know what they know, they'll want us killed, then resurrected, then killed again. Then made cyberzombies as a grim reminder to anyone who would be stupid enough to try and repeat our feat.

The safest way would be probably dump the data and pretend it never happened. But the damage is already done (the data _is_ stolen, and corpsec would hardly accept 'we read the data and got os scared that erased it' as a valid defence), so we should probably try to benifit from it at least somehow, at least in a way to ensure our survival.
That's where I'm stuck. I can imagine what happens when the mega knows about the theft (and I'm pretty sure it 'when', not 'if'), but still would appreciate some gruesome details (IMG:style_emoticons/default/wink.gif) So we have to act quick. But I don't think we can just know on the door of some mega and say 'hi, I'm Joe Nobody, I have some data you would kill for, so, um, if you give me a couple of millions and corp citizenship, it's all yours'. So, again, what can we do and what we probably should do in a situation like this?