Hey Stealth,
I do hope your plan includes leaving Stealth in the DA! I would be heart broken to see ya go..
Since you did say alt pirate I'll assume you are staying.
I have other pirates in McRaging, Black Bart's Krewe, and O'Fury's Court, all which are very active and awesome guilds. However you will need open chat for BBK. Like the others said, check out the threads here at POF and at the other forum and see who you are interested in. I'm sure they would love to host your alt and getting experience in other guilds will give you great ideas to bring back home
Kat