You might want to narrow down where abouts you want to stay, as once you hv picked the area, this will help narrow down your properties. Location can be everything! Whether you want to be right on Disney's doorstep, close to Downtown Disney, bars and restaurants, or in amongst it all on International Drive. Most condos and villas are located a bit further out due to zoning regulations, but can still be a good choice, as there are 6 of you.
I agree with Drewbenski and Indiana Jones, if you want to stay at a Disney Resort, there are many pros to those properties and very few cons, the main one for me was higher prices for basic rooms, (tho the resorts themselves were brilliant!). If you wanted to stay off site tho, you could try a hotel that has suites, some with extra adjoining rooms, such as Hawthorn Suites. We hv stayed at 2 of their properties, on in Lake Buena Vista, right next door to the Downtown Disney area, and another 1 block off International Drive, near the Sand Lake/I4 junction, classed as the Hawthorn Suites Universal. Check their website http://www.hawthornlakebuenavista.com/
and use google earth to plot exact locations. Google Earth is a great tool to use as you can see exactly where you are in relation to everything else!. Both were reasonably priced for a large 2 room suite with 2 double beds plus double sofa bed, (or you can get adjoining room to make into a 2-bed suite, which also gives you 2 bathrooms, but you hv to ctc hotel direct for those rates usually), fully fitted kitchen with huge fridge/freezer, (great for cold drinks to take to the parks with you!) dining table and 2 TV's in the rooms, PLUS complimentary breakfast with hot items, cereals, breads pastries, fresh fruit and drinks (not gourmet but usually enough to set you up for the day), complimentary evening canapes and drinks, (beer & wine included!), pool and fitness room. I would say the Lake Buena Vista one is slightly better condition than the Universal one, which did look a little tired in places when last we stayed, and LBV is also closer to Disney, but both offer good value for money. Staff were great at both properties and both locations were a quiet haven, as not in busy areas, not really much thru traffic or noisy bars/restaurants really close by.
If you go for a villa, there are thousands to choose from, but they will offer you a home from home, with (usually) lots of space, and some even have your own pool. You can book them privately with the owners or you can book through booking agents that represent many owners, or complete estates.
Also, please don't underestimate the value of knowledge. You can do all the research yourself, which as you hv seen, can be mindblowing, or you can go to a travel expert, either your local travel agent or large or nationwide travel companies. You may save yourself a few dollars by doing it yourself, but if anything goes wrong, your holiday could be ruined (been there, done that!!). And the travel agents can arrange everything for you without any hassle, accommodation, tickets and extras!
Which ever you choose, I sure you will have a great trip.