From where I sit, the price you're paying for a family plan is not all that bad. We are self employed and pay more than that for coverage that isn't as good as what you describe.
If you decide to go for cheaper insurance on your own, then make sure that you know what you're in for. I recently needed an MRI - $250 co-pay. Physical therapy went from $40/visit in 2010 to $60/visit in 2011. I've been going every week, twice a week since the beginning of Dec. I'm still not done. My daughter's prescription went from a $20 copay to over $70/month.
You might be able to get a policy like I have and pay less than what your employer's policy is costing but you might wish you had better coverage if you start having to pay for all the higher out of pocket costs.
This is kind of what scares me and stops me from looking elsewhere!