Approx $750/yr through The Hartford buys:
Replacement cost guaranteed on $50,000 worth of bodies, glass, lights, stands, bags, cards, backgrounds, grip equipment, etc, etc, etc...
$1,000,000 liability / $2,000,000 aggregate. $10,000 medical for other persons. Miscellaneous coverages for computers, data, printers, paper, ink, toner, monitor, modem, tablet/pen, External Hard Drives, etc...
I also carry an additional $1,000,000 personal umbrella policy that goes over the top of everything else so even if I prang someone's P-51 or P-38, I'm covered! 
Only thing I don't carry yet is O&E coverage (Errors and Omissions) but I don't work with contracts or the expectation levels in the same manner that say, wedding shooters do. If I get to the point where I'm being hired first and then shooting, we'll probably look into the O&E thing. As it stands, most of my current income is derived from shooting first and selling later or making arrangements through connections that come from just generally being at aviation events.