Again, that also depends on how much you want to spend. The most ecomonical would be an AS resort, with a code rate, 2 rooms would probably run you $120 a night. 2 rooms at a moderate, also with a code would be, $180 per night. 2 rooms at a deluxe would start at $240 per night and go up from there. I have a friend who is staying at Holiday Inn Family Suites, which is off site. I think she's paying $120 per night, and she could fit 6 in, but only one bathroom. Also, two people would have to sleep on a sofa bed in that type of arrangement. Now, if you were interested in renting DVC points a 2 bedroom would start at $220 a night(Old Key West, cheapest season, and Sun - Thurs stay to $600 per night, VWL or BCV highest season on a Fri or Sat night). It also depends when you plan on traveling. Personally if you want to stay on site, the best option would be 2 rooms at an AS, it's ecomonical and affordable, but not fancy.
ONe more thing, if you intend to stay off-site, you'd have to SERIOUSLY consider a rental vehicle. Most off site shuttles, with the exception of the DTD hotels, only run every half hour or sometimes only once an hour. Also, a lot of them only drop off at the TTC, and then you're on your own to get to/from whichever park you intend to visit that day. If you don't intend on getting a rental car, then stay on-site, it's your best bet.