All rooms can accomodate your needs however it depends on how much room you want...
A studio will be a little larger than your average hotel room. It would have a queen size bed and a sleeper sofa (unless you stay at Old Key West, then it is 2 queen beds). You would have a mini fridge, microwave and sink also in the room. These rooms have a regular hotel style bathroom. (accomodates 4)
A one bedroom will have a master bedroom with a king size bed and luxury bath (jacquzzi tub). A living room with a sleeper sofa and a full kitchen. (accomodates 4)
A 2 bedroom is all the amenites of the one bedroom listed above, with a second bedroom added to it that has 2 queen beds and a seperate bathroom. (accomodates 8)
There is also a Grand Villa which sleeps 12

Just so you know it has The same amenites as the one bedroom, Master bedroom, sleeper sofa in the living room, full kitchen and then 2 extra bedroom, with bathrooms in each... and 2queen (or 2 full) beds in each room.
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DVC resorts do not provide rollaway beds (although some will offer an air mattress) so if your boys don't like to sleep together you might want to take that into consideration. A one bedroom would accomodate your party with plenty of room without being ontop of each other.