When you send ALL the invites tag me on this thread (@TheTrader) and i will add 500 REPS to your account.
TBH your requirements are not cool though. There are good user who registered recently or they don't have 500 posts. Somebody might has 500 posts "I apply" and a few feedbacks from shitty GAs and an other user to have 5 posts and 1 of these posts (and 1 feedback) to be from an HDBits.org invite GA. Who is the best user?