Hello everybody. I would describe myself as a non-professional photography enthusiast, since I have a different day job to pay the bills, but I do make some money here and there from photography (have sold a few pictures to businesses, done a wedding, etc). Last year I did the family Christmas card of a friend, and I did it for free, since it was fun for me and the first time I did such a thing (I know, I know, I ruined somebody's business). It turns out they were very happy, and this year they want to pay me to do it again. I don't really need the money, but it certainly feels good (plus it justifies new equipment), so I'm planning to charge them a reasonable price. And here is where I need your help. What it is "a reasonable price". I will probably spend half a Sunday at their place planning, setting up, shooting (eating dinner) and then several hours in post. How much would you professionals charge for something like this? I live in Knoxville, TN, in case you want to take cost of living into account.

Thanks for any input,
Anthony