Parents, how much is too much for a child's birthday party?

I’m not talking about one of the biggies, I’m talking about a boy turning 6. I priced his wish list locations, the range was $400 to $600. The $600 is out – no questions, no way. I’m close to biting the bullet and booking the Monkey Joe’s party; however, the price just kills me!

Before I do this, does anyone have any other suggestions for a birthday party for a soon-to-be 6 year old boy?