OK, findbyme, you're scaring me a little bit!!!
Your enthusiasm is wonderful, but are you sure you want to commit $15K (plus annual dues) to Disney when you've never even entered the state?!?!
To answer you're questions, the numbers you quoted are the "going rate" for SSR. No concerns there. There are 5
DVC resorts at Walt Disney World. You would be buying an ownership interest in one of them. SSR is really the only resort that Disney is selling now, but you can buy points at the others on the resale market.
The main reason to buy your points at one resort over another is that you get a 4-month booking advantage at your Home resort. You can book a trip up to 11 months in advance at your Home, but only 7 months ahead at the other DVC resorts. This can be important if you want to stay at one particular resort during a high occupancy time period. The busiest times at DVC resorts are Spring Break and the period from Thanksgiving through the New Year. Two resorts in particular, the Beach Club and Boardwalk, can also be hard to book in October and November due to special events at Epcot (which is right next door.)
With that said, there are a couple of reasons to consider Saratoga Springs. First, it's the easiest resort to buy. As you probably found out today, you could have given your credit card number on the phone to leave a down-payment and you'd be half way to owning points at that resort. SSR is also the only resort to give you a full 50 years worth of ownership. SSR contracts end in 2054, while all of the other resorts' contracts end in 2042.
If you are interested in a resale, you'll probably pay closer to $75-77 per point when all is said and done. But, you get a shorter contract and it can take additional time and energy to close on a resale.
I'd seriously consider waiting until you visit Disney in Feburary to make a decision on DVC. There are other point-based timeshares around if you want the flexibility to use your points around the country. With DVC you can use your ownership toward stays at non-disney resorts and hotels, but not necessarily very wise to do so. Disney is the Cadillac of timeshares with some of the highest maintenance fees in the industry. If you want a timeshare that you can use around the country (or world), it may be worth investigating an option with equal flexibility, but lower annual dues.
Just don't want to see you making a pricey decision that you will regret later.
Regarding your Use Year question, the best UY is one that immediately PRECEEDS your normal travel dates. If you would often vacation in February, a February Use Year would work great. The primary consideration is the window in which you are able to bank your points if they will not be used. You have six months to bank 100% of your points into the next year if you will not use them. So, if you schedule a trip for February and then have to cancel it, you still have until July 31st to decide whether you will use your points later in that year, or if you want to bank them to the next year.
Good luck in your decision, and don't be afraid to ask more questions.