Re: Opinions on 6 wt rods?
I don't have any experience with the rods that you mentioned, but I do own a rod for very similar purposes.
For big streamers, I'd definitely recommend going up to a 7wt (or even an 8) - I use a 10' 7wt Sage ONE - as the 6 just doesn't have the muscle. For nymphing a 6wt will probably do the trick.
Both the BVK (as previously mentioned) and Winston passport would be good options in your price range.