Having recently scoured the forum for info on gig bags myself, have you came across probags (
www.probag-net.com)? Again, I do not have one but, I read nothing but praise for them. Also, they're the folks that made the well-liked Low End gig bags that are coveted around the forum. Originally I had made up my mind to go with them as I wanted a leather double bag. At around $190 the probag seemed like an obvious choice. Ultimately though, I read so much good about the Mono that I changed my mind - it also helped sway me that I would have to wait about a month for the probag as they're built to order outside uof the US.
I'm extremely happy with the Mono; it's a great bag. The only thing that I read concerning complaints was the fact that other bags had more storage. I have no problems with the storage space in my Mono. Others might want more but it suits me just fine.
While we're here - although presumably outside the OP's desired price range - some others considered were Undercover, Mooradian, iGig and Access. The Undercover bags seem to come highly recommended but, for me, I couldn't find enough pics to clarify that it was rigid enough nor did it have two separate compartments for each bass. The Mooradian is extremely lightweight and concerned me with not providing enough barrier for me to be comfortable with $4000 worth of basses in it. From all points though they receive very high praises. The iGig bags received lots of good marks for the strength of the bag and storage but was said to be relatively heavy. Since i was looking for a double, i did not want something that was said to be on the heavy side. Although I did not know it then, Access makes the newest revision of the Sadowsky Portabag that has received many rave reviews here on TB - it's essentially their Stage 5 bag. I had looked at it then but, not being a double (which is what I preferred) I decided against it. Very nice bag though.
Good luck in your search for a higher-end bag. I know there's lots of choices out there and it took me awhile to make up my mind.