Kenny- With the extension of the sale I would think you'd be making a huge mistake not to rescind. And, before anyone jumps down my throat, it is not because I am jumping on the rescind and buy resale bandwagon, although I do think that you can do much better in the resale market.
The very fact that you are still questioning your decision tells me you are not convinced that it is the right one. For most people, 22K is somewhere between a tremendous amount and a significant amount of money, and you should be reasonably confident of what you are buying before spending it. It seems to me that you still have more to understand and should take at least a few more weeks to understand it.
Off the bat, there are a few things, besides the price, that bother me wrt what you want and what you've purchased. Foremost is you don't really seem interested in using it. Another thing is that the places you want to trade into are all hard properties to get so you want to have a strong trader. Lakeshore will be brand new so it will likely be a fabulous trader for the first two years, but then it won't be so brand new and it will still be in Orlando. I am not so sure that it will consistently get you into peak weeks at top resorts, especially as the kids get older and you want that 2BR in Maui, Caribbean, etc.. Better traders can be bought elsewhere resale for less money.
I haven't sensed that you really looked into whether or not you want to be able to trade for points. I am not going to argue with you to buy resale if you feel you will avail yourself of that opportunity and make good use of it, and that it makes sense to you financially. There are other threads which you can easily read through that discusses that issue. But- unless you know enough about trading for points that you feel paying extra is worthwhile for you and your family, you should hold off buying.
Rescind now, call or e-mail the salesperson if you'll feel better (although that's not necessary) and tell them you need a few more weeks to reconsider, and take the opportunity to learn more about things.