I recently bought a very nice MONO M80 bag. It's very sturdy and heavily padded but still fairly lite. I think my new BSR5 GN is going to be very happy with it.
I also have a Roadrunner bag for my Sadowsky J that is incredible. Sturdy and padded like a tank so it's a tad heavy. It was discontinued a few years ago and replaced with a few others that are just plain crap. One of the best gig bags I've ever seen (at any $$$) I'm glad I bought one while they were in production.