I'm actually looking at xferring at least my shamans at the end of the season.
I'm at a point where I hate my server as it seems to always be in the low pop category even shortly after free transfers get opened to it. In addition, our battlegroup (vengeance) isn't nearly as active as the others, so it's very hard to keep my team above 1800. What I've been looking for is a higher pop server that's in a decent battlegroup. So after compiling the list several times, I finally wrote a small program that takes the census data and combines it with the arena rankings to make a better decision on the US-PVP only realms:
The problem with the census sites is that they only show you the server population, and not the # of 80s, where their datafiles contain that information. I'm also looking to where horde is either outnumbered or close. After running my program, I get the following data:
http://www.garysdecks.com/WoW/RealmData.png
So from the list, it looks like Ner'zhul will likely be my destination (1.3 : 1 alliance/horde ratio), over 6000 active alliance 80s, and the #1 battlegroup.