It is all about negotiation, but there are 2 rules of thumb:
1. Don't break 6 digits, stay below $100k. Anything more is a "good" salary where you might not be hungry enough -- or at least this is the perception.
2. Make sure you pay yourself enough that you can live frugally and not worry about money -- the last thing a VC wants to see is a founder waiting tables at night
Every investment is case-by-case, and the less you can pay yourself, the better. My understanding (and I only have a few datapoints) is that somewhere between $60-90k annually is a fine salary for a founder. There are caveats of course, but I think these are numbers that most VCs would not balk at.
In my experience with VC, though, if you are not the hypothetical scammer we have been talking about here and you have the right investors, it should be a conversation you can have. "You: I think I need $75k a year to be effective, is that ridiculous? VC: No. Sounds good to me. You: Okay!"
Note: this is for founders. It is totally different for employees.