Yeah, Salary.com and the like are very generic but often it gives a "range" in which to work with. It seems that your boss values the work you do. If you are doing work that no one else wants/can do your salary should reflect that expertise. If you are really at a loss just go through your current expenses and future wants/needs (within reason) figure out what it would require to live within those means and go from there. If you feel the number is to high, maybe compromise. If your future needs come within a reasonable range ask for that amount, maybe a little more. I'm sure your boss is willing to work with you. I my experiences employers usually ask "what are you worth" because in many cases the employee will respond with a lower number than if the employer were to just give you what they think your worth. Unfortunalty its all a game. Don't short change yourself.

Not much advise, just my thoughts. I wish I could give you clear cut answer but there isn't one. Don't be afraid of asking for to much, the worst they will say is no. At least then your boss has a number to work with. Together you will figure something out.

Again good luck. Its a pretty cool position to be in, although stressful obviously.