What are everyones favorite picks in this sector? Do you agree the sector still has a lot of potential upside for a couple years?

I am starting a fresh portfolio and I very much would like to have a position in this sector. I am looking at the obvious candidates of course (Lockheed & Northrop), but I also very much like Precision Castparts (PCP).

They are trading at 52 week highs and report on 5/9 so i'm not sure if not is the best time to get in or not, however their earnings/growth/fundamentals look great.

Anyone else take(taking?) the plunge on this stock? Would you rather just stay with the big names?