A quick thing I noticed looking at your build was that you are using a 2h weapon - there has been alot of debate on this, but as enhancement, I would suggest running with two 1h maces (speed ideally 2.6 to 2.8). For me, I notice that my dps drops significantly when I run my enhancement shammy with anything other than 2 1h weapons - but you should experiment yourself (I know I was not a believer at first).

See http://www.wowwiki.com/Windfury_Weapon for a discussion on why you want your weapon speed to be less than, but arround 3.0.

Another good source for enhancement shammy's is http://elitistjerks.com/f31/t13297-e...rycraft_vol_i/ .

I would suggest checking out http://www.wowwiki.com/Shaman_tactics (see the PVP section) if you have not done so.