You said in your post that you have more than one character in your guild who is raid ready? I may have miss read but that's what it sounded like. Why don't you choose the one you would most like to progress on and take it out of the guild and venture for a new guild, one which tickles your fancy.
That way if anybody needs any help at any time you still have a character in the guild and you can still enjoy that sense of community you get from the guild, but on the other hand you can be progressively raiding on your other character, and who knows - once they see you're getting some decent progression on your other character, they might decide that they too want to raid. You can then leave your new guild and go back or raid with your 'comfortable' guild on the character who is still in the guild.
I suppose that's how I would go about it personally but it all comes down to you in the end my friend.
"An Optimist will see an opportunity in every difficulty, while a pessimist will see a difficulty in every opportunity."