i've bought all his books already, i need some more inspiration!
or kindly share fav buttercream site.

..moving to Cake Decorating.

Mike Terry is amazing. I have seen him demo several places - he was at the Americolor booth at ICES Convention 2008 in Orlando. Check out
http://bakerypros.com/
He has a couple of DVDs available. His fat buddies are too cute

DeDe Wilson works almost exclusively in buttercream. She has two books that I have found very helpful--"Wedding Cakes You Can Make" and "The Wedding Cake Book". Her designs and methods can be applied to all types of cakes.