I just called last week looking for a BCV studio the second week of May. There were no studios, but there were 1 BRs available.
Another thing you can try...If you are buying direct from
DVC, you can make ressies as soon as you pay your deposit. BUT, you have a ten-day recision period under Florida law, and Disney gave us 14 days on our add on last year. You could make your deposit, and if you find you can't get what you want, you can always rescind your purchase.
The other thing to remember, of course, is that DVC is a very long term proposition. If you can't get what you want today, at six months, you might be able to get it in future years.
I also agree you should not buy someplace you don't want to stay, but I did not read your OP that way. If you really intend to stay at one of the Epcot resorts most of the time, you'd do well to buy one of them. BCV in particular is not going to get any easier to book in the seven month window going forward.