I love the moderates but have to say I don't find the room amenities/size to be that much more over the values. If the mods had queen sized beds that would be different! Where they shine imho, is in the outdoor theming, pools, landscaping and they are generally more laid back. However, if you won't use those amenities (hot tub, slide, full service restaurant) than don't pay for them and stay at a value! I have to say I have enjoyed some nice pool days at the values but do enjoy wandering around those moderates and taking in the theming and landscaping. And having a lake, river, boat or something a bit above and beyond what the values can offer can be really nice sometimes. But I also enjoy the values and don't find them just places to sleep and shower.
In some ways, my family has found the perfect solution, All Star Music! We stayed there last month and loved it. The newly refurbbed rooms, pool side activities and the lovely landscaping (far nicer than the other values), plus the fact its quieter than the other values made us feel less like we were staying at a value. We fell in love with it and would not hesitate to stay there again esp. given the money we saved.
Again, I love the moderates (CBR is my favorite) but think you need to make sure that the $400 extra is really going to be worth it. And regardless of where you stay, rent a car. With that much resort dining, it would be a time consuming pain not to have a car.