All good Advice.
Eric, I'll be at Waterworks league this week. I expect to see you throw a 150g Valkyrie all night. To be fair, I don't know many people who throw a Valkyrie as well as you and make it look so effortless.
D Craft, I'll definitely look at the Latitude line of discs, seem lightweight and if they work for your eight year old will be about the right speed (I hope). I'm not even sure how often he will use them, but he had fun at my house.