For my purposes, I'm satisfied with the SuperEgo.
It's a matter of trade-offs. For me, the Empire Builder and Zephyr offer those neat suspended file-folder thingies for papers. I would love to have something like that.
But my experience with the Horizontal Freudian Slip and the largest version of the Clear Organizer Pouch has been very positive.
I don't know what kind of interactions and settings you encounter with the people you do business with. Sometimes appearances can be an issue ("it's the clothes that make the man"), but I really feel that if your client is judging you on the appearance of your briefcase, and they bother to talk to you about it, you can just say "It's a Tom Bihn. Made in U.S.A. It's very versatile and durable and I'm very satisfied with it." Some people might think someone who spends over $150 for a briefcase is crazy, just like they might think spending extra money to buy a MacBook Pro over a Dell Inspiron is extravagent. From where I sit, if they're putting that much weight on judging you by the style of the briefcase you carry and not on what you have to say/offer in your meeting, it may be time for you to make a judgement of the prospective client's attitudes and priorities, not the other way around.
If you're concerned about lugging around something in a business setting that might look too loud, perhaps the best thing to focus on would be color choices, like going all-black. Again, for me,
you keep your fingers off my indigo/black/steel Super Ego! 