If you can look into home away from home, that might be great, a grand villa and a one bedroom or a couple studios might fit you well. However if you aren't DVC this can cost a bit. (you can rent points for around 10$ a point.) You can stay at Beach Club Villas, Wilderness lodge and or Boardwalk along with the forementioned OKW (a great idea for a big group.) There also is the soon to be open SSR. Then your group will have washer and dryers, DVD or VCRs, large rooms to hang out in and full kictens. It really makes groups at WDW really nice.
A Grand villa at OKW during dream season (not the most expesnise, but not value) will cost 439 a week, and 45 points each addtions no weekend night. a stuido sleeps (one room) and is 10 points a weeknight and 24 for Fri and sat (the price doubles or more on weekends. 20 for a one bedroom (also sleeps 4 but has 2 rooms, a kicten and washer and dryer.)
BCV, VLW and BW cost sligtly more points, not every one has grand villas.
www.disboards has a place under DVC where you can rent points from members. Beware, doing this will make you want to join DVC.
Mod choices. We have stayed at all the mod s and like POR the very best (AKA Dixie Landings.) It has a great food court, good thememing, nice pool and lots of fun. It is my 1st choice for a mod resort. We like it tons better then CB. CSR also is very nice, great pool, good kiddy area, very beutiful. The food court is not as friendly and convenent.
Have a magical vacation. What time of year are you planning on going? Also condiser a few people getting AP and they reserve the rooms, this may save you hundreds of dollars, (up to 40% per room) but the codes don't come out until a few months before, so you might need to reserve the rooms, then update the ressies when the codes come out. Also if any of the members from your group is from FLA there are speical discounts for them too (both on tickets and rooms.)