As much as you can get. Why worry about the poor negotiating skills of almost everyone else? Either you're looking to cover your living expenses or you're looking to maximize your revenue. If the former who cares what anyone else makes, if the latter who cares what average is. If you want to maximize your revenue learn to negotiate, it's still mostly summer and there is lots of cash and few devs. Get multiple offers…
Thanks for the advice, it's well received.