When I had the same question, I found a post by Kal (please correct me if I'm wrong) which stated a minimum should be platinum, and diamond if you can swing it (paraphrasing a little). He was 100% correct. The two reasons I can think as to why you may not want to would be cost as a barrier to entry or that you want (and will use) a specific week which happens to not be platinum or diamond. As for cost, if you are patient, you can find a deal every now and again on flEaBay, when it's time to sell, you will probably get your initial cost back out if it's a platinum or diamond... Less likely for a 1300 point unit. As for week, that is a personal choice, but you better be thinking of using that week most years and not trading to the other locations.