Where do you guys suggest to go to find a new raiding guild? I am okay with having to transfer servers.
Realm forums, guild recruitment forum, trade chat, WoWProgress (check for guilds that are recruiting and they should have a link to their website), MMO-Champion guild recruitment.
And you can always post a personal ad for yourself in the guild recruitment forums and look at responses (I forget if there's a specific subforum for that though.)
I would look for top realms first and check out their realm forums first before looking anywhere else. Though WoWProgress does have some filters that you can sort through for times, classes, etc.
I'd be more detailed but I'm on my phone at the moment. Should be enough to get you started though.
But I'd definitely look at high pop/top progression servers first since if things don't work out with a guild there you have a good place to fall back on, instead of say, the top guild out of only a handful on a smaller server.
Unless you really don't give a shit about transfer fees. Personally I'm too entrenched with 9 90s on Mal'Ganis at this point unless I got desperate.