there is a section based at mead park but the main council is in the town centre itself.
the cost of dvc itself depends on how many points you purchase but the minimum points to purchase when we joined in 2006 was 160, which is enough to do a 2 week hols in a studio but you can purchase more points at any time if you want to.
dvc is better than a timeshare in the sense that as long as you have enough points, you can go on hols at any time of the year as opposed to other timeshare's where you purchase specific weeks and then can only holiday within that timescale.
different times of year are grouped together in terms of their point values and obviously staying at grand floridian would cost you more points per night than staying at key west but again the flexibility is there for you to do what you want to.
also the resorts included in dvc are worldwide so, as much as we'd love to go to florida every year, we cannot afford to so for the points we had to use last year, we spent a week in the lake district which was beautiful.
you can bank your points too but have to use them within 2 years but you can also borrow from a future year if you need to so it think it's great.
next time you're in florida i would definitely recommend spending a couple of hours looking round one of the resorts... we bought into saratoga springs in downtown disney and they picked us up from our hotel, gave us the grand tour, answered every question that we had about purchasing, gave us time so that when we got back home we could arrange our finances in order to purchase and after our visit they drove us to the front gates of magic kingdom so we could re-join our family... brilliant service and absolutely no pressure to buy (but to be honest once you've had a look around the accom it pretty much sells itself lol)
we will be staying at saratoga springs for the 1st time in september... i cant wait!
good luck with your wedding plans!