Sorry for a bit of negative input, but what's the point of a guild in D3? the game has not a single feature to support this. It's not WoW you know.
you will only be able to group no more than 4 at the most, no guild chat. As i see it, there is very little or nothing to keep a guild going.
It's not that i don't want a guild in D3, would have loved to have a guild-chat running in the background like in WoW. and I really thought Blizzard had put in some guild features to build on the huge success from wow.But unless were more or less at the same lvl and quest, one will always be "wasting time" waiting for the rest to catch up. The rest you can only chat with, person to person, not really something that makes a community flourish sadly.