I think what we need right now is more delegation of work so that we can grow and cultivate the community while the roster grows. This includes:
Forums: would like a place to post links, organize events, talk about WvW strats, or just hang out and get to know everyone in the community better
Officers/class leaders: There is already a small pool of dedicated leaders, I think the pool should grow slightly to compensate for the sheer amount of people in the guild. I know some officers in mumble sometimes grown at the time it takes to weed through new applicants and guild duties limiting the actual 'play' time you have (cough you Porthos).
I will gladly volunteer to setup and administer a forum http://simple-press.com/ or https://www.phpbb.com/downloads/ As well as helping on the application process.
As far as the application process, I think all of your options have their pros and cons, I am partial to options 2 or 4.
Xandivh