There are some compelling opportunities in Berkshire's portfolio, and here are my two favorites right now.There are a few dozen stocks in the $375 billion portfolio owned by Berkshire Hathaway (BRK.A 1.46%) (BRK.B 1.12%), with most of the larger investments hand-picked by legendary investor Warren Buffett himself. And while there are several attractive opportunities for investors to choose from, there are two stocks in particular that look like strong buys as we head into June.With that in mind, here are tw ...