Buying a resale is neither better nor worse than direct from
DVC. It's simply...different.
If you buy SSR, you get 49 full years, $85 per point, and the second lowest annual dues in the program.
If you go resale, you get 38 years, will probably pay a net cost in the $78-80 range, and your dues will vary by resort. Resales can be especially advantageous if you get a contract that has banked points from the prior year, and current year's points available. Be careful--some contracts are already borrowed against and you may not get any sizable number of points until 2006.
Finances aside, the most important reason to choose your Home resort carefully is the 11/7 month booking window--you have 11 months to book your Home, and only 7 to book the other properties. If you are convinced that you want to spend the vast majority of your stays at one property, then you should definitely buy at that property. When the 7 month window arrives, you will be competing with EVERY SINGLE DVC member to book any resort.
For example, it doesn't make much sense to buy at OKW if you want to stay at BCV most of the time. By and large, folks that have been members for several years have been very successful in booking non-Home properties at 7 months. Don't make yourself play the waiting game if you want to stay at one resort 75% of the time.
If you really just want a room and appreciate all of the resorts for what they offer--or if you can't even book your trips more than 7 months out--the most economical purchases will probably be OKW Resale (lowest dues) or SSR direct from DVC (for the low dues and extra years on the back end).
Good luck!