Depending on your budget, you should really consider the Home Away from Home Resorts (Old Key West, Boardwalk Villas, Wilderness Lodge Villas and the Beach Club Villas which open July 1, I think).
For a family your size, I would suggest a 2 bedroom villa. You'll get a master bedroom with a king sized bed, LARGE bathroom with a whirlpool tub, two vanities and a separate shower. Plus a 2nd bedroom with 2 queen sized beds (at OKW; other resorts have 1 queen sized and a fold out sofa), a bathroom for the 2nd bedroom, plus a living room and full kitchen, and at least one balcony. And there's a washer and dryer in the villa! One of the sofa's in the living room will be a sofa bed, giving you the 5th bed you're looking for. There will be 3 TVs (one in each bedroom and 1 in the living room). Plus with 3 daughters, I'm sure the 2nd bathroom would come in handy!
You can stay at any of the above resorts by paying with cash through CRO, or you can rent points from a member of the Disney Vacation Club. You can look for points to rent at:
DVC Point Rental board
You can check to see how many points you'd need to rent at:
DVC Points calculator
In general, people charge around $10 per point to rent points to you.
These resorts are absolutely beautiful, but beware, you may get used to all the extra space. I've been a DVC owner for only 2 years now, and I keep thinking I need to add more points! Plus we've gotten spoiled, and now I only want to stay in 1 bedrooms!
Look into this option - in my opinion, it's the best way to go!