This post is precisely why I believe the store will thrive. There are a hundred different record shops in NYC, but none specialize in limited and hard to find items. The main reason I can spend hours digging deep in a store is because I'm looking for a future prized possession. While I love listening to vinyl and appreciate the musical quality aspect of it, something else I really love is collecting and being able to say "Yeah, I have my favorite album by X band, and it's actually 1/500 in an orange splatter pressing."
The fact that you are working with labels to get out of print items is attracting as well. Secondhand markets are rough on the wallet and drive me crazy since none of the extra profit is going to the people who deserve it.
Unfortunately I won't be able to make your grand opening, but I will gladly give my honest feedback when I arrive in August! It would certainly benefit me to have a store like this thrive in East Village.