I think it's never a good idea to buy just enough points to book the lowest cost category, if it's the most limited in quantity. SV studios are already the first category to go and they might develop a serious availability issue at 11 months. Better to buy enough points for preferred and then be happy if one can get standard.
It's true that Tower Studios are cheaper, but they are also considerably smaller. They've been described by DisneyTouristBlog as "claustrophobic for 2 people", and they're used to visit Japan, where hotel rooms are the size of the average closet of US houses. They're a good deal for 1 or 2 people but they're not for everyone. SV studios will be the hottest commodity at Riviera.
It's true that Tower Studios are cheaper, but they are also considerably smaller. They've been described by DisneyTouristBlog as "claustrophobic for 2 people", and they're used to visit Japan, where hotel rooms are the size of the average closet of US houses. They're a good deal for 1 or 2 people but they're not for everyone. SV studios will be the hottest commodity at Riviera.