>I already told them that the money could be a problem. They said they usually start off new developers as I, and then after 6 months they promote them as appropriate. The offer was for the max in the I payscale. They told me that if I met expectactions then I would be promoted to a II, with the pay scale more in line with what I was making now. I have since asked them to define the expectations and asked for it all in writing, as advised.
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>I usually try to leave my positions with as much grace as possible. I figure I never know if I need to obtain some sort of contract position with them in the future.

The Chinese cook's revenge is more of a legend, but doesn't happen too often. And the word about whatever happens when one leaves usually precedes him in the new place. Worst case, they make a party when you're gone (I know some people for whom such were held). Best case, they make you a farewell party. Usual case, you leave your toys in order, leave instructions for the next guy (or have trained him), and are available for phone help for a week or two (which, most often, works wonders - they never call, but it so helps if you say they can call you).

Sometime, the best revenge is to just do your best and leave the software working in best condition - knowing that it will break as soon as they touch something, because the one horsepower it was running on will be gone.