I would spend a few months getting aquatinted and educated. If you haven't stayed at a given resort, there is a risk buying there. Assuming BLT and VWL end up being your 2 favorites and you want to stay at one of those MOST trips, I'd likely buy at both. I'd suggest resale for the same UY though buying at one and at SSR for the other will be cheaper and also makes sense. That's why you need to get information and experience. Do you really need 500 points, hopefully you're not looking to buy for cruises and the like, if so you need to understand the increased costs and risks involved.