I can answer some of your questions, but you will get tons more peple on the DVC board. We've been members since OKW opened in 1991 and have stayed there too many times to count. We love it. OKW is a very relaxing resort, and the huge villas are, for us, the number one pro. We always rent a car, so I can't help much with the buses. Some people say it isn't bad. IMHO OKW is best with a car. We know the WDW roads so well now that it takes no time at all to go from place to place, and we love being able to get in our car and just GO to wherever we want. One of the cons that some people mention is that there is no slide at the pool at OKW. This has never bothered us, but if you really want a slide it may not be your "cup of tea". If you really liked being able to walk to Epcot and MGM I would suggest that you stay at BWV. OKW has the atmosphere of a Florida community. There isn't as many dining options there as other resorts. You really need a car to get to anywhere real quick. This is just my opinion. We love OKW and think of it as a second home, but I personally wouldn't think of staying there without a car.
Happy Planning!!!