I'm 6'1 almost 6'2 and around the 200lb mark. Current CGA vest is the O'Neill Assault vest.
Best CGA vest I've ever owned. When I first picked it up at a shop I thought it was a comp vest because it was so light. Uses their but Nytrolite foam so it barely absorbs water, dries extremely
Fast and is plenty flexible.
http://us.oneill.com/shop/assault-l-s-uscg-vest/
I like the snug fit if a large myself but depending on your chest/ shoulder size an XL might be better.