I have had a lot of Berk pork and can't say I've ever found it much like commercial pork. Sure, it's pork. The flavor is fuller to me and it is (or should be) much less lean, thankfully. Regardless, for me it is always worth seeking out pastured pork, irrespective of breed, as the conditions that commercial pork are raised in are deplorable to me.
It's worth seeking out and trying for yourself though, imo. I also like Duroc (I often have one or more Duroc crosses in a pen), Guinea, Old Spots - there are many.
Oregon has an abundance of farms that raise pastured pork, beef, chicken - and lots of lamb. Many sell to farmers markets, direct off the farm, or via mail. See
here for many of them. Contact them (if their websites don't have the info) if you are interested in knowing the breeding stock used. (Don't miss the Gunieas that Full of Life Farm is raising, due summer 2010.)