Currently I have liability insurance though Philadelphia Insurance Companies (an affiliate of IDEA). You can find out more about them through either of the links provided by James or Michael.
In the past I’ve been insured through K&K Insurance but the price was nearly identical to the quote I got from IDEA’s affiliate. I’ve had no problems with either of these companies and would recommend them both the same.
Here’s a link for more info about K&K in case you’re interested:
Best of luck to you finding the best deal!