I join everyone here in thanking you for the review. It provides a lot of good info and samples; taken together with Roger's bench testing, I think we have a good "picture".
As far as the large, expensive filter, I do use a UV at times, esp. when I'm at the beach, I'd rather wipe spray and sand off the filter than off the lens. So I did splurge for the B&W MRC filter for about 160.00. That and a new ball head will get me up to 1500.00 which is about how much I had "budgeted"..