If you're working with costs, it's less expensive to get a 5 person room at Port Orleans than a family suite. There are no standard rooms at a value for 5 people.
We have 5 people that we have to pay for now and we just stayed at POR in March. The room was plenty big enough for the 5 of us AND significantly cheaper than any of our options at the values.
Yes, we have priced lots of different options for a family of 5, and POR is the cheapest option. And works for our family. May be a little crowded, but we don't hang out in our room much, spend most of our time out & about!
You might also consider renting DVC points and staying at a 1-bedroom villa. This option ended up being cheaper for our family of five this year without free dining.