If you gig out then a hard case is very good insurance for the sizable investment that we have in our arranger keyboards. I had a case custom built for my Lionstracs Mediastation X-88 Pro. The company was Case Technology ( http://www.keyboardcases.com ) and I am very pleased with their product. I chose a custom case because I wanted a snug fit for my keyboard as well special positioning of the handles and latches, which they were glad to accomodate.

If you do not need a custom case then both SKB and Gator make hard cases that can be found at most music retailers in standard sizes that may fit you needs. I have had a handle break off of a SKB case as well the metal framing begin to come loose after a some years of heavy use. I have not traveled with a gator but for a short time so I can't speak to its durability, but it seems solid.

I think that the Case Technology product will be more durable, but only time will tell. Here is a website that sells a variety of cases including these types as well as the semi-hard type. I had a semi-hard type some years ago that I used to transport my Korg I-3. The case was made of a very stiff foam and covered with a canvas type material. This case did not last well at all! I think they would be appropriate only for very light use and with a very light keyboard.

Hard cases are the way to go, in my opinion.
Hope this helps.

Richard