I am looking at costs and it seems that the cost per point varies considerably (I have seen vero beach at $52 pp and VGF close to $150).
Just don't forget about the maintenance fees. Right now a GF owner pays $2.37 less per point in maintenance fees than Vero Beach. Considering how much more money GF resale points are, it's still not a bad deal to buy those Vero Beach points. But bear in mind, the maintenance fees probably won't rise at the same amount. I'd argue the standalone DVC properties (Vero Beach, Hilton Head, Aulani) will probably see maintenance fees rise at a higher rate because at the Disney World DVC properties there is already a city-sized apparatus in place to maintain the WDW facilities anyway, which to some degree results in less cost to maintain the properties.
BUT...
Saratoga Springs owners pay $2.71 less per point in maintenance fees than Vero Beach right now. Old Key West pays $2.07 less. Those resales are routinely in the low-to-mid 80s.
200 Vero Beach points @$52pp = $10,400.
200 SSR points @$82pp (per one of the current listings at the Timeshare Store) = $16,400.
A difference of 6 grand.
But you'll pay $542 more in maintenance fees the first year alone if you buy @ Vero Beach versus Saratoga Springs. If the difference in maintenance fees remains the same (and again, I'd suspect Vero Beach will be raised higher, faster) then in 11 years the total difference that you paid is wiped clean and Vero Beach will start to be a more expensive investment. For a reference, in 2004, when Saratoga opened, fees were $3.80 per point there and $4.67 at Vero Beach. In 12 years, that spread went from .87 per point to 2.71, more than triple the difference.
(Meanwhile the difference to buy into Grand Floridian vs. Vero Beach means the point where the fees overcome the savings is over 4 decades in the future. I'm not even sure a Vero beach contract lasts 40 more years at this point!)
Saratoga might be the better value, if your plan is to buy resale but always try to book at WDW, outside your home resort at the 7 month window.
Speaking of which, I'm a Saratoga owner. Since buying, I've taken 6 trips to WDW and 3 trips to Hilton Head (and used points once for a trip to San Francisco). Only one of those 6 WDW trips were we unable to get the resort we wanted at the 7 month window (assuming we tried to get a different resort in the first place), that was a trip in early December of 2008, which is a very popular time for DVC members as points values are low but the parks are decked out for the holidays.