Chuck:
As a fairly constant Road Warrior, I have learned that tastes and opinions in luggage vary widely, and can provoke sometimes heated discussions, but throwing caution to the wind ...
My all time favorite suit/wardrobe bag also happens to be fairly cheap (around 100 bucks) and is available from Mens Wearhouse. It ain't fancy, just your basic hanging suit bag, but it also has a packing duffle bag in the shape of a tube built in, that can handle toiletries, shoes, socks and what 1940s movie comedies so quaintly refer to as "unmentionables."
Thing that makes this bag so great is that where a closet is available, you treat it just like any other garment bag. But if hanging space is not available on the plane (and while moving through the airport), the garment bag rolls around the tube, making for a very compact bundle that fits easily in the overhead or under the seat, if need be. Since you are rolling rather than folding, suits and shirts stay wrinkle free.
You can access both ends of the tube part, for easy access to the items that need to be removed when you go through TSA security.
Just one man's opinion, but for what it's worth ...
http://www.menswearhouse.com/menswear/detail.jsp?FOLDER%3C%3Efolder_id=1408474395560695&FOLDER%3C%3EbrowsePath=1408474395560695&bmUID=1195674774592
Mark J. Golden, CAE
Executive Director & Chief Executive Officer
National Court Reporters Association