Hi Gabriel!
Walt Disney World is very strict on occupancy limits, and perks like Extra Magic Hours or Park Tickets (if you've purchased a package) are linked to your room key.
I'd be happy to help outline some of the options for you.
First, you've mentioned two of the options available for larger families: a family suite at the All Star Music or two adjoining rooms at the value resorts. Two additional options are the family suites at the Art of Animation or, for quite a price difference, a Deluxe Villa resort.
Most often the most economical choice will be the two adjoining rooms at a Value Resort. Usually the All Star resorts and Pop Century price out at about the same rate.
For budget friendly tips, I can highly recommend a site called Mousesavers.com. It's a fact filled site with how to make the most of your Disney budget. Also, keep an eye on the
Special Offers at Walt Disney World Resort. The current discounts and promotions change throughout the year, but the ones currently being offered will be listed there. Check often as they change often!