Index rebuild itself update stats so, you do not have to update stats after index rebuild.

here is one script from web. But if you google it you will find many more., Choose the one which suits you best.

http://sqlfool.com/2009/03/automated-index-defrag-script/

But before implementing this... read through this..

http://msdn.microsoft.com/en-us/library/ms189858.aspx