Well it's been a long time since I played with any of the folks mentioned, apart from a brief spell with NFD on the Daoc Ywain server. I'd like get more involved with WvW in GW2 but two things hamper this, one is the queue (can't do much about that) the other is a lack of folks to run with. Just like Daoc, it needs a bunch of people working together to achieve stuff if you want to do anything beyond tagging along with the zerg. So, I'd welcome the chance to run with and represent a WvW active guild.
That said, WvW will probably be enough PvP for me. Guild Group based sPvP (the tournament mode) doesn't really interest me, it's too competitive and too much like WoW Arena (which I never enjoyed). The casual sPvP you can't join as a guild group anyway, as we found out the other evening when we got placed on different sides!
Regarding Ravens Of Death, the guild exists on all servers, the name is unique and cross server. I believe the guild chat works cross server too. But any points earned for the guild remain on the server they were earned on. So if anyone moves servers they can still be a member of RoD if they want to but will find things like the guild bank will need to be re-earned on the new server. The representation system means it is possible to have one character representing one guild and, if desired, have an alt representing another. I think you can swap representation on a per-session basis too.
My only note of reservation would be the server community. The folks on Gandara seem generally nice, although in WvW they seem mostly disorganised. No idea how Gunnars Hold compares. I guess with free transfers still in place at the moment there's not a huge risk in moving.