Hello,
You should check out Deathwing and more specifically, the guild <Proud> on alliance . Even though there is a majority of EU/other players in the guild, there is also quite of few Americans ( like myself ) actively raiding. Also, their raid time suits Americans decently. They raid at 6PM EST or 10 PM ST which is convenient for Americans.
If you want to know more about <Proud>, go check out
http://forum.warmane.com/showthread....oud-gt-(A)-PvE
Also feel free to private message me for more information.